The professional practice of behavior analysis is one domain of behavior analysis: the others being radical behaviorism, experimental analysis of behavior and applied behavior analysis.
 The professional practice of behavior analysis is the delivery of 
interventions to consumers that are guided by the principles of 
behaviorism and the research of both the experimental analysis of 
behavior and applied behavior analysis. Professional practice seeks 
maximum precision to change behavior most effectively in specific 
instances. Behavior analysts are mental health professionals
 and, in some states, may hold a license, certificate or registration as
 a behavior analyst. In other states, there are no laws governing their 
practice and, as such, the practice may be prohibited as falling under 
the practice definition of other mental health professionals. This is 
rapidly changing as Behavior Analysts are becoming more and more common.
The professional practice of behavior analysis is a hybrid discipline with specific influences coming from counseling, psychology, education, special education, communication disorders, physical therapy and criminal justice. As a discipline it has its own conferences, organizations, certification processes and awards.
The professional practice of behavior analysis is a hybrid discipline with specific influences coming from counseling, psychology, education, special education, communication disorders, physical therapy and criminal justice. As a discipline it has its own conferences, organizations, certification processes and awards.
Defining the scope of practice
The Behavior Analysis Certification Board (BACB) defines behavior analysis as:
The field of behavior analysis grew out of the scientific study of principles of learning and behavior. It has two main branches: experimental and applied behavior analysis. The experimental analysis of behavior (EAB) is the basic science of this field and has over many decades accumulated a substantial and well-respected research literature. This literature provides the scientific foundation for applied behavior analysis (ABA), which is both an applied science that develops methods of changing behavior and a profession that provides services to meet diverse behavioral needs. Briefly, professionals in applied behavior analysis engage in the specific and comprehensive use of principles of learning, including operant and respondent learning, in order to address behavioral needs of widely varying individuals in diverse settings. Examples of these applications include: managing behavior of children in school settings; enhancing the abilities, and choices of children and adults with different kinds of disabilities; training animals; and augmenting the performance and satisfaction of employees in organizations and businesses.
As the above suggests, behavior analysis is based on the principles of operant and respondent conditioning. Applied behavior analysis (ABA) include the use of behavior management, behavioral engineering and behavior therapy. Behavior analysis is an active, environmental-based approach.
Currently in the U.S. some behavior analysts at the masters level
 are licensed; others work with an international certification where 
licenses are unavailable, although this may not be allowed in some 
states or jurisdictions. At the doctoral level many are licensed as psychologists
 with Diplomate status in behavioral psychology or licensed as licensed 
behavior analysts. Diplomate status alone, however, does not allow one 
to practice in every state and each state's regulatory statute must be 
reviewed for the appropriateness and legality of practice.
Certification
The Behavior Analyst Certification Board (BACB) offers a technical certificate
 in behavior analysis. The American Psychological Association offers a 
diplomate (post PhD and licensed certification) in behavioral 
psychology.
The meaning of certification
BACB is a private non-profit organization without governmental powers
 to regulate behavior analytic practice. However it does wield the power
 to suspend or revoke certification from those certified if they violate
 the strict ethical guidelines of practice. As many states are without a
 licensure act, this has been sufficient to deter violators as it 
removes their ability to vendor with the state, schools, and insurance 
companies under that certification. While the BACB certification means 
that candidates have satisfied entry-level requirements in behavior 
analytic training, certificants are able to practice independently 
within the scope of their practice and training. Thus, a BCBA (such as 
those who go into marketing, engineering, or other approved fields in 
which BCBAs work) who has never trained to work nor worked with children
 diagnosed with autism should not attempt to do so independently. Most 
health insurance companies also recognize the BCBA credential as one 
conferring the capability and the right to practice independently in 
many states (including California with the recent passage of SB 946 into
 law).
Some states still require certificants to be licensed by their 
respective jurisdictions for independent practice when treating 
behavioral health or medical problems, and a number of states including 
Arizona and Nevada have created a specific BCBA licensing program (for a
 full list please refer to the BACB website). Licensed certificants must
 operate within the scope of their license and within their areas of 
expertise. Where the government regulates behavior analytic services, 
unlicensed certificants may be supervised by a licensed professional and
 operate within the scope of their supervisor's license when treating 
disorders if that jurisdiction allows such supervision. Unlicensed 
certificants who provide behavior analytic training for educational or 
optimal performance purposes do not require licensed supervision, unless
 the law or precedent prohibits such practice. Where the government does
 not regulate the treatment of medical or psychological disorders 
certificants should practice in accord with the laws of their state, 
province, or country. All certificants must practice within their 
personal areas of expertise.
Licensure
The
 model licensing act for behavior analysts has been revised several 
times to reflect best practices and policy. Previous versions included 
provisions that would have made it in practice more difficult then to 
obtain the necessary experiential hours for license and independent 
practice as a clinical psychologist.
Once the person is licensed public protection is still monitored 
by the licensing board as well as the BACB, both of which make sure that
 the person receives sufficient ongoing education, and the BACB and 
licensing board investigate ethical complaints. In February 2008, 
Indiana, Arizona, Massachusetts, Vermont, Oklahoma and other states now 
have legislation pending to create licensure for behavior analysts. 
Pennsylvania was the first state in 2008 to license behavior specialists
 to cover behavior analysts. Arizona, less than three weeks later, 
became the first state to license behavior analysts. Other states such 
as Nevada and Wisconsin have also passed behavior analytic licensure.
In California, after the defeat of a bill to create a license for
 BCBAs in 2011, the state government instead passed SB 946 which 
mandates that all non-governmental insurance agencies reimburse for BCBA
 for behavior therapy in treating autism, starting in 2012. Unlike many 
weaker bills mandating that autism be covered by insurance, SB 946 does 
not currently impose an arbitrary cap on services by age or funding 
amount – in this it is similar to other treatments such as those for 
heart attacks or other chronic conditions.
Service delivery models
Definitions
Behavior analytic services can be and often are delivered through various treatment modalities. These include:
- Consultation – an indirect model in which the consultant works with the consultee to change the behavior of the client.
 - Therapy – (individual, group, or family) in which the therapist works directly with a person with some form of pathology to lessen the pathology.
 - Counseling – where the counselor works directly with a person who has problems but no pathology.
 - Coaching – in which the coach works with a person to achieve a life goal.
 
Primary methods
The two primary methods
 for delivering behavior analytic services are consultation and/or 
direct therapy; the former involves three parties: consultant, consultee
 and a client whose behavior is changed (who may or may not be present 
for all meetings).
Consultation can involve working with the consultee (i.e., a 
parent or teacher) to build a plan around the behavior of a client 
(i.e., a child or student), or training the consultees themselves to 
modify the behavior of the client. Within the domain of parent–child 
consultation, standard intervention includes teaching parents skills 
such as basic reinforcement, time-out and how to manipulate different factors to modify behavior.
Direct therapy involves the relationship of behavior analyst and 
client, usually one-on-one, in which the analyst is responsible for 
directly modifying the behavior of their client. Direct therapy is also 
used in schools but can also be found in group homes, in a behavior modification facility and in behavior therapy (where the focus may be on tasks such as quitting smoking, modifying behaviors for sex offenders or other types of offenders, modifying behaviors related to mood disorders) or to encourage job seeking behavior in psychiatric patients.
History of behavior models
Two
 older and less used models still exist for the delivery of behavior 
analytic services. These models worked mostly with normal or typically 
developing populations. These two models are the Behavioral Coaching and the Behavioral Counseling
 model. Both were very popular in the 1960s–1980s but have recently seen
 a decline in popularity, in spite of their success, as proponents 
argued the merits of holding strictly to learning theory. The Association for Behavior Analysis International still retains a special interest group in behavioral counseling and coaching.
History of behavioral counseling
Behavioral counseling was very popular throughout the 1970s and at least into the early 1980s.
 Behavioral counseling is an active action–oriented approach that works 
with the typically developing population but also assists people with 
specific/discrete problems such as career decision making, drinking, 
smoking or rehabilitation after injury.
Life coaching
The behavioral coaching model is sometimes referred to as life coaching. However, like counselors and psychologists, life coaches can have varied orientations/change theories (see behavioral change theories).
 Behavioral life coaches operate mainly from a behavior analytic 
orientation. Unlike therapy this model is applied to people who desire 
to achieve a specific goal such as increasing their assertiveness with others.
 This model is educational and is usually presented as an alternative to
 therapy. Coaches use behavioral techniques such as objective setting, 
goal setting, self-control training and behavioral activation to help 
clients achieve specific life goals. Behavioral coaching was sometimes 
used to teach job skills to people having mental retardation or head 
injury. In this area the model made extensive use of task analysis, 
direct instruction, role play, reinforcement and error correction. Often this approach employs techniques of direct instruction.
Goal of increasing reinforcement
Behavioral
 counseling was largely seen as a growth model that tried to increase 
the individuals sense of "freedom" by helping the client reduce 
punishment or coercion in their lives, build skills, and increase access
 to reinforcement.
 B.F. Skinner created a video discussing the processes involved and the 
importance of reinforcement to increase the sense of "freedom". Behavioral counseling attempts to use in-session reinforcement to improve decision-making, functional assessment of the clients problem, and behavioral interventions to reduce problem behaviors.
Social learning in behavioral counseling
Some behavioral counselors approach therapy from a social learning perspective
 but many held a position based on the use of behavioral psychology with
 a focus on the use of operant, respondent conditioning procedures.
 Some who did adopt a position on modeling held closer to the behavioral
 view of modeling as generalized imitation developed through learning 
processes.
Weight loss
The behavioral counseling approach became very popular in weight reduction
 and is on the American Psychological Association's list of 
evidence-based practices for weight loss. Behavioral counseling for 
weight loss by Richard B. Stuart led to the commercial program called Weight Watchers.
 Recently, efforts have been made to resurrect interest in behavioral 
counseling as a method to effectively deliver services to normal 
problemed populations.
Treatment of autism
Among the available approaches to treating autism, early intensive behavioral interventions (EIBIs) have demonstrated efficacy in promoting social and language development and in reducing behaviors that interfere with learning and cognitive functioning. In addition, such therapies have led to increased intellectual skills and increased adaptive functioning. Even with past successes, behavior therapists continue to develop models of social skills.
Therapy qualifications
These are generally treatments based on applied behavior analysis
 (ABA) and involve intensive training of the therapists, extensive time 
spent in ABA therapy (20–40 hours per week) and weekly supervision by 
experienced clinical supervisors—known as board certified behavior 
analysts. ABA therapy often employs principles of overlearning to help acquire mastery and fluency of skills.
Children with autism
The
 ABA approach teaches many skills such as appropriate play (a precursor 
to social interaction and engagement with the world and others), social, motor and verbal behaviors as well as reasoning skills and the ability to self-regulate appropriately. ABA therapy is used to teach behaviors to individuals with autism who may not otherwise observe these behaviors spontaneously through imitation.
In recent years the ABA approach has been criticized by members 
of the autistic community. Many have reported suffering from 
post-traumatic stress disorder as a result of being forced to comply 
with training procedures.
Imitation
Imitation can also be directly trained.
 ABA therapies teach these skills through use of behavioral observation 
and reinforcement or prompting to teach each step of a behavior.
Research and treatments
Extensive
 research exists to show that behavior analysis is an effective 
treatment for autism with literally hundreds of studies showing its 
effectiveness with persons of all ages in enhancing functioning, 
building skills and independence as well as improving life quality.
 What remains controversial are claims of behavior analysis "curing 
autism". This controversy exists because behavior analysis is used to 
alter rates of behavior, and not the condition of "autism." Nonetheless,
 behavior analysis is used to treat the behaviors of many in the 
autistic population.
 While several small studies exist showing that behavior analysis holds 
promise in this area, the number of well-controlled studies do not rise 
to the level required by the American Psychological Association to hold 
the treatment as empirically supported in this area.
Misconceptions of treatment
An
 increasing amount of research in the field of applied behavior analysis
 is concerned with autism; and it is a common misconception that 
behavior analysts work almost exclusively with individuals with autism 
and that ABA is synonymous with discrete trials teaching. ABA principles
 can also be used with a range of typical or atypical individuals whose issues vary from developmental delays, significant behavioral problems or undesirable habits.
Curriculum development in behavior analytic programs for children with autism is important.
 Curriculum should carefully task analyze the skill needed to be learned
 and then ensure that proper tool skills have been taught before the 
skill itself is attempted to be taught. Applied behavior analysis is often confused as a table-only therapy. Properly performed, applied behavior analysis should be done in both table and natural environments depending on the student's progress and needs.
 Once a student has mastered a skill at the table the team should move 
the student into a natural environment for further training and 
generalization of the skill.
Frequently standardized assessments such as the Assessment of Basic Language and Learning Skills
 (ABLLS) is used to create a baseline of the learner's functional skill 
set. The ABLLS breaks down the learner's strengths and weaknesses to 
best tailor the applied behavior analysis curriculum to them. By 
focusing on the exact skills that need help the teacher does not teach a
 skill the student knows. This can also prevent student frustration at 
attempting a skill for which they are not ready.
Many families have fought school districts for such programs. Donald Baer,
 a behavior analyst who often testified as an expert witness, provided 
several letters to lawyers before he died. Ohio State has archived those
 letters.
Discrete trials
Discrete trials were originally used by people studying classical conditioning to demonstrate stimulus–stimulus pairing. Discrete trials are often contrasted with free operant procedures, like ones used by B.F. Skinner in learning experiments with rats and pigeons, to show how learning was influenced by rates of reinforcement. The discrete trials method was adapted as a therapy for developmentally delayed children and individuals with autism. For example, Ole Ivar Lovaas
 used discrete trials to teach autistic children skills including making
 eye contact, following simple instructions, advanced language and 
social skills. These discrete trials involved breaking a behavior into 
its most basic functional unit and presenting the units in a series.
A discrete trial usually consists of the following: the 
antecedent, the behavior of the student and a consequence. If the 
student's behavior matches what is desired the consequence is something 
positive: food, candy, a game, praise, etc. If the behavior was not 
correct the teacher offers the correct answer then repeats the trial 
possibly with more prompting, if needed.
There is usually an inter-trial interval that allows for a few 
seconds to separate each trial to allow the student to process the 
information, teach the student to wait and make the onset of the next 
trial more discrete. Discrete trials can be used to develop most skills 
which includes cognitive, verbal communication, play, social and 
self-help skills. There is a carefully laid out procedure for error 
correction and a problem solving model to use if the program gets stuck. Discrete trial is sometimes referred to as the Lovaas technique.
Discrete trials have been helpful in the treatment of pediatric feeding problems as well as in the prevention of feeding problems.
Free operant procedures
In language training, many free operant procedures emerged in the late 1960s and early 1970s.
 These procedures did not try to train discrimination first, and then 
passively wait for generalization, but instead worked from the start on 
actively promoting generalization.>Stokes, T.F. & Baer, D.M. (1977). "An implicit technology of generalization". Journal of Applied Behavior Analysis. 10 (2): 349–367. doi:10.1901/jaba.1977.10-349. PMC 1311194. PMID 16795561.
 Initially the model was referred to as incidental teaching but later was called milieu language teaching and finally natural language teaching.
 Peterson (2007) completed a comprehensive review of 57 studies on these
 training procedures. This review found that 84% of the studies of the 
natural language procedures looked at maintenance and 94% looked at 
generalization and were able to provide direct support of its occurrence
 as part of the training.
Other applications of applied behavior analysis
Clinical behavior analysis
Dougher's edited volume titled Clinical Behavior Analysis on 
Context Press highlights the application of behavior analysis to adult 
outpatients. He identifies four comprehensive behavior analytic 
programs: Stephen Hayes et al.'s acceptance and commitment therapy (ACT), Jacobson et al. behavioral activation (BA), Kohlenberg & Tsai's functional analytic psychotherapy, exposure therapies (i.e., Systematic desensitization), and the community reinforcement approach
 for treating addictions. In addition, the book highlights several 
recent areas of functional analysis research for common clinical 
problems. Many of these areas are specified in the section on behavior therapy.
Community reinforcement approach and family training
The study of behavioral factors related to addictions has a long history. Thus it is no surprise many behavioral treatments would be found to be efficacious.
 One efficacious approach is the community reinforcement approach. The 
community reinforcement approach has considerable research supporting it
 as efficacious. Started in the 1970s by Nathan H. Azrin
 and his graduate student Hunt, the community reinforcement approach is a
 comprehensive operant program built on a functional assessment of a 
client's drinking behavior and the use of positive reinforcement and contingency management for nondrinking. When combined with disulfiram (an aversive procedure) community reinforcement showed remarkable effects. One component of the program that appears to be particularly strong is the non-drinking club. Applications of community reinforcement to public policy has become the recent focus of this approach.
An offshoot of the community reinforcement approach is the community reinforcement approach and family training.
 This program is designed to help family members of substance abusers 
feel empowered to engage in treatment. The rates of success have varied 
somewhat by study but seem to cluster around 70%.
 The program uses a variety of interventions based on functional 
assessment including a module to prevent domestic violence. Partners are
 trained to use positive reinforcement, various communication skills and
 natural consequences.
Children with disruptive disorders and parenting
With children, applied behavior analysis provides the core of the positive behavior support movement and creates the basis of Teaching-Family Model
 homes. Teaching-Family homes have been found to reduce recidivism for 
delinquent youths both while they are in the homes and after they leave.
 Operant procedures form the basis of behavioral parent training 
developed from social learning theorists. The etiological models for 
antisocial behavior show considerable correlation with negative 
reinforcement and response matching. Behavioral parent training or Parent Management Training has been very successful in the treatment of conduct disorders in children and adolescents with recent research focusing on making it more culturally sensitive. In addition, behavioral parent training has been shown to reduce corporal or abusive child discipline tactics. Behavior analysts typically adhere to a behavioral model of child development in their practice.
Recidivism
Recent studies showing that behavior analysis can reduce recidivism have led to a resurgence in behavior therapy facilities. Of particular interest has been the growing research on the Teaching-Family Model which was developed by Montrose Wolf and clearly reduces recidivism rates. In addition, behaviorally-based early intervention programs have shown effectiveness.
Exposure therapy
Methods of counter-conditioning and respondent extinction, called 
exposure therapy, are often employed by many behavior therapists in the 
treatment of phobias, anxiety disorders such as post-traumatic stress disorder (PTSD), and addictions (cue exposure). Prolonged exposure therapy has been particularly helpful with PTSD.
 Several procedures to block respondent conditioning such as blocking 
and overshadowing are sometimes used in behavioral medicine to prevent 
conditioned taste aversion for patients with chemotherapy treatments. Exposure with Response Prevention (ERP) is a respondent extinction procedure often used to treat obsessive–compulsive behavior. Escape response blocking is critical for this procedure. For PTSDs exposure therapy is one of the few evidence-based techniques.
 Recent research suggests exposure therapy is an excellent means of 
alleviating both the anxiety and cognitive symptoms specific to PTSD 
with no additive effect for additional cognitive components.
 Several authors have argued that exposure by itself is necessary and 
sufficient to produce behavior change in reducing fear in social phobics
 and helping them engage more effectively with others. The Washington Post
 ran a story that only exposure therapy is proven for PTSD and that 
cognitive therapy or even drug therapy are not shown at this time to be 
effective.
Operant-based EEG biofeedback
Kamiya (1968) demonstrated that the alpha rhythm in humans could be operantly conditioned. He published an influential article in Psychology Today
 that summarized research showing subjects learn to discriminate when 
alpha was present or absent, and that they could use feedback to shift 
the dominant alpha frequency about 1 Hz. Almost half of his subjects 
reported experiencing a pleasant "alpha state" characterized as an 
"alert calmness". These reports may have contributed to the perception 
of alpha biofeedback as a shortcut to a meditative state. He also 
studied the electroencephalography (EEG) correlates of meditative states. Operant conditioning of EEG has had considerable support in many areas including attention deficit hyperactivity disorder (ADHD) and even seizure disorders.
 Early studies of the procedure included the treatment of seizure 
disorders. Luber and colleagues (1981) conducted a double blind 
crossover study showing that seizure activity decreased by 50% in the 
contingent conditioning of inhibiting brain waves as opposed to the 
non-contingent use.
 Sterman (2000) reviewed 18 studies of a total of 174 clients and found 
82% of the participants had significant seizure reduction (30% less 
weekly seizures).
Organizational
Behavior analysis with organizations is sometimes combined with 
systems theory in an approach called organizational behavior management.
 This approach has shown success particularly in the area of behavior-based safety.
 Behavior safety research has lately become focused on factors that lead
 programs to being retained in institutions long after the designer 
leaves.
Educational
Direct instruction and Direct Instruction:
 the former representing the process and the latter a specific 
curriculum that highlights that process remain both current and 
controversial in behavior analysis. The essential features are a carefully structured fast-paced program based on teacher-directed small group instruction. One controversy that remains is that teacher creativity is admonished in the program.
 Even with such issues to be worked out positive gains in reading for 
the approach have been reported in the literature since 1968.
 An example of the positive gains reported by Meyer (1984) found that 
34% of children in the DISTAR group were accepted to college as compared
 to only 17% of the control school. Current research is focused on peer delivery of the program.
School-wide positive behavior support
 is based on the use of behavior analytic procedures delivered in an 
organizational behavior management approach. School-wide behavioral 
support has been increasingly accepted by administrators, lawmakers and 
teachers as a way to improve safety in classrooms.
Curriculum-based measurement and curriculum matching is another active area of application.
 Curriculum-based measurement uses rate and reading performance as the 
primary variable in determining reading levels. The goal is to better 
match children to the appropriate curriculum level to remove frustration
 as well as to track reading performance over time to see if it is 
improving with intervention. This model also serves as the basis for response to intervention models.
Functional behavioral assessment was mandated in the United States for children who meet criteria under the individuals with disabilities education act.
 This approach has precluded many procedures for modifying and 
maintaining children in not just the school system, but in many cases in
 the regular education setting. Even children with severe behavior problems appear to be helped.
Teaching children to recruit attention
 has become a very important area in education. In many cases one 
function of children's disruptive behavior is to get attention.
Hospital settings
One area of interest in hospitals is the blocking effect—especially for conditioned taste aversion.
 This area of interest is considered important in the prevention of 
weigh loss during chemotherapy for cancer patients. Another area of 
growing interest in the hospital setting is the use of operant-based 
biofeedback with those suffering from cerebral palsy or minor spinal injuries.
Brucker's group at the University of Miami has had some success 
with specific operant conditioning-based biofeedback procedures to 
enhance functioning.
 While such methods are not a cure, and gains tend to be in the moderate
 range, they do show ability to help remaining central nervous system 
cells to regain some control over lost areas of functioning.
Residential treatment
Behavioral interventions have been very helpful in reducing problem behaviors in residential treatment centers. The type of residential versus mental retardation does not appear to be a factor. Behavioral interventions have been found to be successful even when medication interventions fail.
Space program
Probably one of the most interesting applications of behavior analysis in the 1960s was its contribution to the space program.
 Research in this area is used to train astronauts including the 
chimpanzees sent into space. Continued work in this area focuses on 
ensuring that astronauts who live in confined areas and space do not 
develop behavioral health problems. Most of this work was led by pioneer behaviorist Joseph V. Brady.
Consumer and professional relationships
Open
 communication and a supportive relationship between educational systems
 and families allow the student to receive a beneficial education. This 
pertains to typical learners as well as to individuals who need 
additional services. It was not until the 1960s that researchers began 
exploring behavior analysis as a method to educate those children who 
fall somewhere along the autism spectrum. Behavior analysts agree that 
consistency in and out of the school classroom is key in order for 
children with autism to maintain proper standing in school and continue 
to develop to their greatest potential.
Applied behavior analysts sometimes work with a team to address a
 person's educational or behavioral needs. Other professionals such as 
speech therapists, physicians and the primary caregivers are treated as 
key to the implementation of successful therapy in the applied behavior 
analysis (ABA) model. The ABA method relies on behavior principles to 
develop treatments appropriate for the individual. Regular meetings with
 professionals to discuss programming are one way to establish a 
successful working relationship between a family and their school. It is
 beneficial when a caregiver can conduct generalization procedures 
outside of school. In the ABA framework, developing and maintaining a 
structured working relationship between parents or guardians and 
professionals is essential to ensure consistent treatment.
Intervention goals
When working directly with clients, behavior analysts engage in a process of collaborative goal setting. Goal setting ensures that the client is already under stimulus control of the goal and is thus more likely to engage in behavior to achieve it. Behavior analytic programs are ultimately skill building, they enhance functioning, lead to higher quality of life, and build self-control.
 One of the most distinguishing features of behavior analysis has been 
its core belief that all individuals have a right to the most effective 
treatment for their condition. and a right to the most effective educational strategy available.
History
Applied behavior analysis is the applied side of the experimental analysis of behavior. It is based on the principles of operant and respondent conditioning and represents a major approach to behavior therapies. Its origin can be traced back to Teodoro Ayllon and Jack Michael's 1959 article "The psychiatric nurse as a behavioral engineer" as well as to initial efforts to implement teaching machines.
The research basis of ABA can be found in the theoretical work of behaviorism and radical behaviorism originating with the work of B.F. Skinner. In 1968 Baer, Wolf and Risley wrote an article that was the source of contemporary applied behavior analysis
 providing the criteria to judge the adequacy of research and practice 
in applied behavior analysis. It became the core and centerpiece behavioral engineering. 
Work in respondent conditioning (what some would term classical conditioning) began with the work of Joseph Wolpe in the 1960s. It was improved by the work of Edna B Foa who did extensive research on exposure and response prevention for obsessive–compulsive disorder (OCD). In addition, she worked on exposure therapy for post-traumatic stress disorder.
Over the years most behavior analysts have existed and conducted 
research in many areas and University departments: behavior analysis, 
psychology, special education, regular education, speech–language 
pathology, communication disorders, school psychology, criminal justice 
and family life. They have belonged to many organizations including the American Psychological Association (APA) and have most often found a core intellectual home in the Association for Behavior Analysis International.
Current research
Behavior analysis remains one of the most active research areas in all of psychology, developmental disability, mental health and other studies of human behavior. Current research in behavior analysis focuses on expanding the tradition by looking at setting events, behavioral activation, the Matching law, relational frame theory, stimulus equivalences and covert conditioning as exemplified in Skinner's model of rule-governed behavior Verbal Behavior.
Experimental psychopathology
Experimental
 psychopathology is a behavior therapy area in which animal models are 
developed to simulate human pathology. For example, Wolpe studied cats 
to build his theory of human anxiety. This work continues today in the study of both pathology and treatment.
Historical controversies
Initially, applied behavior analysis used punishment such as shouting and slaps to reduce unwanted behaviors.
 Ethical opposition to such aversive practices caused them to fall out 
of favor and has stimulated development of less aversive methods. In 
general, aversion therapy and punishment are now less frequently used as ABA treatments due to legal restrictions. However, procedures such as odor aversion, covert sensitization and other covert conditioning procedures, based on punishment or aversion strategies, are still used effectively in the treatment of pedophiles.
 In addition, with some populations such as conduct disorder in children
 there is considerable evidence that has developed to show that all 
positive programs can produce change but that children will not enter 
into the normal range without punishment procedures. These programs have shifted to using child time-out and response–cost procedures to ensure that clients rights to effective interventions are met.
Homosexuality
In 1973 the APA removed homosexuality from its Diagnostic and Statistical Manual yet it kept "ego dystonic" homosexuality as a condition until the DSM III-R (1987). In 1974 Ole Ivar Lovaas, pioneer of the use of discrete trial teaching (DTT) to treat autism, was the second author on a journal article describing the use of ABA to reduce "feminine" behaviors and increase "masculine" behaviors of a male child in an effort to prevent adult transsexualism.
 Treatments designed to uphold traditional sex-role behaviors were 
opposed by some behavior analysts who argued that the intervention was 
not justified.
 In the late 1960s Wolpe refused to treat homosexual behavior arguing 
that it was easier and more productive to treat the religious guilt than
 the homosexuality. He instead provided assertiveness training to a 
homosexual client. Most behavior analysts and behavior therapists have not worked in sexual re–orientation therapy since Gerald Davison argued that the issue was not one of effectiveness but of ethics.
 When he wrote the paper presenting this position, Davison was president
 of the Association for the Advancement of Behavior Therapy, now the Association for Behavioral and Cognitive Therapies,
 and thus his views carried much weight. Davison argued that 
homosexuality is not pathological and is only a problem if it is 
regarded as one by society and the therapist.
Ethical practice
Punishment and aversion therapies
The use of punishment
 and aversion therapy procedures are a constant ethical challenge for 
behavior analysts. One of the original reasons for the development of 
the Behavior Analyst Certification Board were cases of abuse from 
behaviorists.
 Both continue to draw proponents and opposition, however, in some of 
the more controversial cases some middle ground has been found through 
legislation.
Sex offenders and recidivism
A study in 1991 showed that behavior modification was effective in sex offender treatment and covert sensitization, and it has been shown to have some effects on reducing recidivism.
 However Gene Able, who has done extensive research in this area, 
suggests that it is not as effective outside of the package which 
contains odor aversion, satiation therapy (masturbatory reconditioning),
 and various social skills training programs including empathy training.
 Current behavior analysis programs offer this type of comprehensive 
treatment approach.
 In addition they use a combination of functional assessment, behavior 
chain analysis and risk assessment to create relapse prevention 
strategies and to help the offender to develop better self-control.
With sex offenders who have retardation, comprehensive behavioral programming has been effective at least in the short run. This treatment included formal academic and vocational training, sex education, a unit token economy,
 and individual behavior therapy including sexual reconditioning. In 
addition it included supported competitive employment, fading of program
 structure, and increased community participation.
Journals
There are multiple journals which produce articles on the clinical applications of applied behavior analysis. The most popular, and widely used, of these journals is the Journal of Applied Behavior Analysis. There are many other journals dedicated to this field. Some of these include The Behavior Analyst Today, the International Journal of Behavioral Consultation and Therapy and three new journals scheduled for release in 2008: Behavior Analysis in Sports, Health, Fitness and Behavioral Medicine, the Journal of Behavior Analysis in Crime and Victim: Treatment and Prevention as well as the Association for Behavior Analysis International's Behavior Analysis in Practice.
Professional organizations
The Association for Behavior Analysis
 International has a special interest group for practitioner issues, 
behavioral counseling, and clinical behavior analysis. The Association 
for Behavior Analysis International has larger special interest groups 
for autism and behavioral medicine. The Association for Behavior Analysis International serves as the core intellectual home for behavior analysts.
 The Association for Behavior Analysis International sponsors multiple 
conferences/year, including the annual conference, annual autism 
conference, biannual international conference, and other conferences on 
specific issues such as behavioral theory and sustainability.
The Association for Behavioral and Cognitive Therapies (ABCT) also has an interest group in behavior analysis,
 which focuses on clinical behavior analysis. In addition, the 
Association for Behavioral and Cognitive Therapies has a special 
interest group on addictions.
Doctoral level behavior analysts who are psychologists belong to the American Psychological Association's division 25: Behavior analysis. APA offers a diplomate in behavioral psychology.