FREE EPPP Study Guide 2026: All 8 Domains

This free EPPP study guide walks through every content domain the Examination for Professional Practice in Psychology (EPPP) tests, organized to the current Association of State and Provincial Psychology Boards (ASPPB) content outline.^[1]

It’s interactive, not a wall of text: every module has built-in checkpoint quizzes, flashcards, and practice questions, so you learn by doing — not just reading.

The EPPP Part 1 (Knowledge) tests eight official content domains. We teach them in five study modules, grouping closely related domains, and we lead with the heaviest-weighted content.

Read a module, test yourself at each checkpoint, then drill gaps with our free practice test and flashcards. This guide is a high-yield overview that maps the official content — not a full psychology curriculum.

EPPP Part 1 vs. Part 2 — what this guide covers

The EPPP comes in two parts, and they are adopted very differently, so know which one you must take:

• EPPP Part 1 (Knowledge) is the long-standing multiple-choice knowledge exam, required by essentially every US and Canadian licensing jurisdiction. This study guide and our flashcards teach Part 1.
• EPPP Part 2 (Skills) is a separate competency exam in a situational/vignette format (170 items, 130 scored). ASPPB once planned to require it everywhere by 2026 but reversed that, so as of 2026only a handful of jurisdictions — such as the District of Columbia, Georgia, Nevada, Guam, Manitoba, and Newfoundland & Labrador — require Part 2.^[3]

EPPP Exam Snapshot

The EPPP covers eight content domains.^[1] Study by weight — Assessment & Diagnosis and Ethical/Legal/Professional Issues are tied as the two heaviest, and with Treatment they make up nearly half the exam:

We teach all eight official domains in five study modules. Module 1 groups the three “bases of behavior” domains (Biological 10%, Cognitive-Affective 13%, Social/Cultural 11% — 34% together); Module 2 covers Growth & Lifespan Development (12%); Module 3 covers Assessment & Diagnosis (16%); Module 4 covers Treatment, Intervention, Prevention & Supervision (15%); and Module 5 groups Research Methods & Statistics (7%) with Ethical, Legal & Professional Issues (16%).

Module 1 · Bases of Behavior

Three official domains — Biological (10%), Cognitive-Affective (13%), and Social/Cultural (11%) — 34% of the exam combined. These are the scientific foundations of psychology, and the concepts here surface throughout the assessment, treatment, and development items.

1.1 Biological Bases of Behavior

Biological bases (10%) cover how the nervous system, brain, and chemistry produce behavior. Start with the neuron: an action potential travels down the axon and releases a neurotransmitter into the synapse, which binds receptors on the next cell and is then cleared by reuptake. This is exactly where most psychiatric medications act — for example, SSRIs block serotonin reuptake to raise its level in the synaptic cleft.^[1]

Know the major neurotransmitters and what they do: dopamine (reward, movement; excess linked to psychosis, deficiency to Parkinson’s), serotonin (mood, sleep, appetite), GABA (the main inhibitory transmitter; targeted by benzodiazepines), glutamate (the main excitatory transmitter), acetylcholine (memory; depleted in Alzheimer’s), and norepinephrine (arousal). Then learn brain localization, including the language areas: Broca's area (nonfluent speech) and Wernicke's area (impaired comprehension), and the limbic system’s role in emotion and memory.

1.2 Cognitive-Affective Bases of Behavior

This domain (13%) — the second-heaviest of the bases — covers learning, memory, cognition, motivation, and emotion. The most heavily tested area is learning.

Classical conditioning (Pavlov) is learning by association: a neutral stimulus paired with an unconditioned stimulus becomes a conditioned stimulus that elicits a conditioned response. Operant conditioning (Skinner) is learning from consequences — and the four-way distinction below is a perennial exam favorite.

Memorize the contrast: reinforcement (positive or negative) increases behavior; punishment (positive or negative) decreases it; “positive” means add and “negative” means remove. Negative reinforcement (removing something aversive, like a beeping seatbelt alarm that stops when you buckle) is the classic trap — it is not punishment.

Know the reinforcement schedules too: variable-ratio schedules (like slot machines) produce the highest, most extinction-resistant responding. Bandura’s social learning adds learning by observation and modeling.

For memory, learn the stages (sensory → short-term/working memory → long-term) and the processes of encoding, storage, and retrieval. For motivation and emotion, know the classic theories of emotion (James-Lange, Cannon-Bard, and Schachter-Singer’s two-factor theory) and the Yerkes-Dodson law relating arousal to performance.

1.3 Social & Cultural Bases of Behavior

Social/cultural bases (11%) cover how people think about, influence, and relate to one another, plus multicultural competence. The most-tested attribution concept is the fundamental attribution error: over-attributing others’ behavior to their character while underweighting the situation. Cognitive dissonance (Festinger) — the discomfort of holding inconsistent cognitions — drives much attitude change and is the engine behind classic persuasion findings.

Know the landmark social-influence studies cold: Asch (conformity to a group’s wrong answer), Milgram (obedience to authority), and Zimbardo (roles and the situation). Group phenomena include groupthink, social facilitation, social loafing, and the bystander effect (diffusion of responsibility). On the cultural side, the exam expects familiarity with acculturation, cultural identity, the difference between individualist and collectivist worldviews, and culturally competent, anti-bias practice.^[1]

Module 2 · Growth & Lifespan Development

One official domain, 12% of the exam. This domain maps how people change across the lifespan — cognitively, socially, morally, and physically — and is rich with named theorists and stage models that the exam tests directly.

2.1 Major Developmental Theories

Four stage theorists dominate this domain. Piaget described cognitive development in four stages: sensorimotor (object permanence), preoperational (symbolic thought, egocentrism, no conservation), concrete operational (logical thought, conservation), and formal operational (abstract reasoning). Erikson described eight psychosocial stages, each a crisis to resolve across the whole lifespan.^[1]

Kohlberg described moral development in three levels (preconventional, conventional, postconventional). Vygotsky emphasized the social context of learning and the zone of proximal development — what a child can do with guidance — and scaffolding. Where Piaget saw the child as a lone scientist, Vygotsky saw learning as fundamentally social.

2.2 Domains of Development

Beyond the stage theories, the exam tests attachment (Ainsworth’s Strange Situation classifies infants as secure, anxious-avoidant, anxious-resistant, or disorganized; Bowlby supplies the theory), temperament, and the nature-versus-nurture interaction. It also covers physical and prenatal development (teratogens, milestones), language acquisition, and changes across adulthood and aging, including cognition in later life and theories of successful aging.

Module 3 · Assessment & Diagnosis

One official domain, 16% — tied for the largest on the exam. This domain is heavy on psychometrics (the science of measurement), the major tests, how to interpret scores, and DSM-5-TR diagnosis. The measurement concepts here also power the research-methods domain.

3.1 Psychometrics: Reliability & Validity

The single most-tested distinction in this domain is reliability (consistency) versus validity (accuracy). Reliability asks whether a test gives the same result on repeated use — measured as test-retest, internal consistency (Cronbach’s alpha), inter-rater, and parallel forms. Validity asks whether the test measures what it claims to.^[1]

Learn the three families of validity: content (the items cover the domain), criterion (the test predicts an outcome — concurrent now, predictive later), and construct validity (the test measures the theoretical trait, supported by convergent and discriminant evidence). The key rule: a test can be reliable without being valid, but it cannot be valid unless it is also reliable — reliability sets a ceiling on validity. Finally, the standard error of measurement lets you build a confidence band around any single score, and it shrinks as reliability rises.

3.2 Major Tests & Score Interpretation

Know the workhorse instruments and what they measure. Intelligence: the Wechsler scales (WAIS for adults, WISC for children) and the Stanford-Binet, all norm-referenced tests with a mean of 100 and standard deviation of 15.

Personality: objective tests like the MMPI-2/MMPI-3 (empirically keyed, with validity scales) versus projective tests like the Rorschach and TAT. Know the normal curve — roughly 68% of scores fall within one standard deviation of the mean, 95% within two — and how percentiles, z-scores, and T-scores relate to it.

3.3 Diagnosis & DSM-5-TR

Psychologists diagnose using current formal criteria. The DSM-5-TR is the field’s classification system; the exam expects you to recognize the criteria and differential diagnosis for common disorders — mood, anxiety, trauma- and stressor-related, psychotic, personality, neurodevelopmental, and substance-related disorders.^[5] Integrate diagnosis with attention to base rates and culture: a diagnosis is only as good as the assessment behind it, and overlooking base rates or cultural context produces error.

Module 4 · Treatment, Intervention & Supervision

One official domain, 15% of the exam. This is where psychology becomes intervention: the major therapy models, what counts as evidence-based practice, biological treatments, and the professional roles of prevention, consultation, and supervision.

4.1 Major Psychotherapy Models

Learn each model’s founder, core idea, and signature technique. Psychodynamic therapy (from Freud) explores unconscious conflict, defense mechanisms, and transference.

Humanistic/person-centered therapy (Carl Rogers) centers on empathy, unconditional positive regard, and genuineness as the conditions for growth. Behavioral therapy applies conditioning (exposure, systematic desensitization, token economies). Cognitive behavioral therapy (Aaron Beck’s cognitive therapy and Albert Ellis’s REBT) restructures distorted thoughts while changing behavior.^[1]

4.2 Evidence-Based & Biological Treatment

Evidence-based practice is the integration of the best available research with clinical expertise and the client’s values and characteristics — not research alone. Know which treatments have the strongest empirical support for common disorders (for example, exposure-based CBT for anxiety disorders). On the biological side, recognize the major medication classes — antidepressants (SSRIs, SNRIs, tricyclics, MAOIs), antipsychotics (typical and atypical), anxiolytics (benzodiazepines), mood stabilizers (lithium, anticonvulsants), and stimulants — plus somatic treatments such as ECT.

4.3 Prevention, Consultation & Supervision

This domain also covers the broader professional roles. Prevention has three classic levels — and the distinction is a reliable exam item.

Consultation is indirect service: a psychologist helps a consultee (a teacher, physician, or organization) improve their work with a third party, in a non-hierarchical relationship. Clinical supervision is different — it is an evaluative, hierarchical relationship in which a supervisor develops a supervisee’s competence and retains professional and legal responsibility for client care. The supervisor must monitor competence, give feedback, manage ethical issues (including multiple relationships and informed consent about the supervision), and act as a gatekeeper for the profession.^[4]

Module 5 · Research, Statistics, Ethics & Law

Two official domains: Research Methods & Statistics (7%) and Ethical, Legal & Professional Issues (16%) — 23% combined. Research is the smallest domain but rewards a little study; ethics is tied for the largest and is highly learnable because the right answer is usually clear once you know the standard.

5.1 Research Methods & Statistics

Start with design and validity. Internal validity is whether a study supports a causal claim (protected by random assignment and control of confounds); external validity is whether the findings generalize. Then hypothesis testing: a Type I error is a false positive (rejecting a true null; probability alpha) and a Type II error is a false negative (missing a real effect; probability beta).^[1]

Statistical power (1 − beta) is the ability to detect a true effect; it rises with larger samples, larger effect sizes, and a higher alpha. Distinguish descriptive statistics (mean, median, mode, standard deviation) from inferential tests (t-tests, ANOVA, correlation, regression, chi-square), and remember that correlation does not imply causation. Finally, report an effect size (such as Cohen’s d), which — unlike a p-value — does not depend on sample size.

5.2 Ethical, Legal & Professional Issues

Ethics is anchored in the APA Ethical Principles of Psychologists and Code of Conduct and in licensing law.^[4] Informed consent is foundational: clients voluntarily agree to services after disclosure of their nature and purpose, fees, the limits of confidentiality, the right to withdraw, and risks and benefits — and it is an ongoing process, not a one-time signature.

Confidentiality is a core duty with defined limits. The most-tested limit is the duty to protect (from the Tarasoff case): when a client poses a serious, imminent threat to an identifiable victim, the psychologist must take reasonable steps to protect that person.

Mandated reporting of suspected child, elder, or dependent-adult abuse is a parallel legal duty that also overrides confidentiality. A multiple relationship — a second role with a client that risks impaired judgment or exploitation — is prohibited when it could reasonably cause harm; sexual intimacy with a current client is always prohibited.

Psychologists also practice within their competence, keep accurate records, and meet legal duties such as HIPAA and, in forensic work, the distinction between treating and evaluating roles.

How to Use This EPPP Study Guide

This guide is built to be worked, not just read. The most efficient path to a pass:

• Confirm which exam you need. Almost everyone takes Part 1 (Knowledge), which this guide teaches; check whether your board also requires Part 2 (Skills).
• Study by weight. Assessment & Diagnosis (16%), Ethics/Legal (16%), and Treatment (15%) are nearly half the exam — lead with them.
• Master the high-yield distinctions. Reliability vs. validity, the four operant consequences, Type I vs. Type II error, the developmental theorists, and the limits of confidentiality recur constantly.
• Check off as you go. Use the Study Guide Contents to mark each section done; it raises your exam-readiness score.
• Take every checkpoint. The end-of-module quizzes show you exactly which domains need another pass.
• Drill the weak domain. Send your weak area into the flashcards and a practice test until the score climbs.

EPPP Glossary

The high-yield EPPP terms in one place — hover any dotted term in the guide, or flip the whole deck here as a self-grading flashcard set.

Action potential

The brief electrical impulse that travels down a neuron's axon when it fires, triggering neurotransmitter release at the synapse.

Attachment

The emotional bond between infant and caregiver; Ainsworth's Strange Situation classifies it as secure or insecure.

Broca's area

A region in the left frontal lobe governing the motor production of speech; damage causes nonfluent (expressive) aphasia with intact comprehension.

Classical conditioning

Learning by association in which a neutral stimulus, paired with an unconditioned stimulus, comes to elicit a conditioned response (Pavlov).

Clinical supervision

A formal relationship in which a senior psychologist oversees and develops a supervisee's clinical competence, retaining responsibility for client care.

Cognitive behavioral therapy

An evidence-based, present-focused therapy that restructures distorted thoughts and changes maladaptive behaviors (Beck, Ellis).

Cognitive dissonance

The discomfort of holding inconsistent cognitions, which motivates attitude or behavior change (Festinger).

Confidentiality

The psychologist's duty to protect client information, subject to legal limits such as duty to protect and mandated reporting.

Conformity

Adjusting one's behavior or beliefs to match a group (demonstrated by Asch); obedience is compliance with an authority (Milgram).

Conservation

Understanding that quantity stays the same despite changes in shape or arrangement; emerges in Piaget's concrete operational stage.

Construct validity

Evidence that a test measures the theoretical trait it targets, supported by convergent and discriminant data.

Defense mechanism

An unconscious strategy (e.g., repression, projection, denial) the ego uses to manage anxiety.

Dopamine

A neurotransmitter involved in reward, movement, and motivation; implicated in schizophrenia (excess in some pathways) and Parkinson's disease (deficiency).

DSM-5-TR

The American Psychiatric Association's current diagnostic manual, used to classify mental disorders by formal criteria.

Duty to protect

The obligation (from Tarasoff) to protect an identifiable victim from a client's serious, imminent threat of violence.

Effect size

A standardized measure of the magnitude of an effect, independent of sample size (e.g., Cohen's d).

Evidence-based practice

The integration of the best available research with clinical expertise and patient values and characteristics.

External validity

The degree to which findings generalize to other people, settings, and times.

Fundamental attribution error

The tendency to over-attribute others' behavior to internal traits while underweighting situational causes.

Groupthink

A mode of group decision-making in which the desire for harmony overrides realistic appraisal of alternatives.

Informed consent

The client's voluntary agreement to services after disclosure of their nature, risks, fees, and the limits of confidentiality.

Internal validity

The degree to which a study supports a causal claim, free of confounds; protected by random assignment.

Limbic system

A set of structures (amygdala, hippocampus, hypothalamus) central to emotion, memory, and motivation.

Mandated reporting

The legal duty to report reasonable suspicion of child, elder, or dependent-adult abuse, overriding confidentiality.

Multiple relationship

A second role with a client beyond the professional one that risks impaired judgment or exploitation; prohibited when harmful.

Negative reinforcement

Removing an aversive stimulus after a behavior to increase it; often confused with punishment.

Neurotransmitter

A chemical messenger released from a neuron that crosses the synapse to excite or inhibit the next cell; examples include dopamine, serotonin, GABA, and glutamate.

Norm-referenced test

A test that interprets a score by comparing it to a representative sample (norms), e.g., an IQ score.

Object permanence

The understanding that objects continue to exist when out of sight; develops in Piaget's sensorimotor stage.

Operant conditioning

Learning in which behavior is shaped by its consequences — reinforcement increases behavior, punishment decreases it (Skinner).

Positive reinforcement

Adding a pleasant stimulus after a behavior to increase it.

Primary prevention

Intervention that reduces the incidence of a disorder before it starts, in a whole population.

Psychodynamic therapy

Therapy rooted in Freudian theory that explores unconscious conflict, defense mechanisms, and transference.

Reinforcement schedule

The rule determining when behavior is reinforced; variable-ratio schedules produce the highest, most resistant responding.

Reliability

The consistency of a measurement across time, items, or raters; types include test-retest, internal consistency, and inter-rater.

Reuptake

The reabsorption of a neurotransmitter back into the presynaptic neuron after it has acted; SSRIs work by blocking serotonin reuptake.

Standard error of measurement

An estimate of how much an observed score would vary across repeated testings; smaller when reliability is higher.

Statistical power

The probability of correctly rejecting a false null hypothesis (1 − beta); rises with sample size and effect size.

Type I error

Rejecting a true null hypothesis — a false positive; its probability is alpha.

Type II error

Failing to reject a false null hypothesis — a false negative; its probability is beta.

Validity

The degree to which a test measures what it claims to; types include content, criterion, and construct validity.

Wernicke's area

A region in the left temporal lobe governing language comprehension; damage causes fluent but meaningless (receptive) aphasia.

Working memory

The limited-capacity system that temporarily holds and manipulates information (Baddeley); a refinement of short-term memory.

Zone of proximal development

Vygotsky's range between what a learner can do alone and what they can do with guidance; the target zone for scaffolding.

EPPP Study Guide FAQ

References

1. 1.Association of State and Provincial Psychology Boards. “EPPP Exam Topics (Part 1 – Knowledge content domains and weights).” asppb.net. ↑
2. 2.Association of State and Provincial Psychology Boards. “EPPP Candidate Handbook.” asppb.net. ↑
3. 3.Association of State and Provincial Psychology Boards. “Examination for Professional Practice in Psychology (EPPP) — overview.” asppb.net. ↑
4. 4.American Psychological Association. “Ethical Principles of Psychologists and Code of Conduct.” apa.org. ↑
5. 5.American Psychiatric Association. “Diagnostic and Statistical Manual of Mental Disorders, DSM-5-TR.” psychiatry.org. ↑

Career Employer

Career Employer is the ultimate resource to help you get started working the job of your dreams. We cover topics from general career information, career searching, exam preparation with free study materials, career interviewing, and becoming successful in your career of choice.

Follow Us:

All Posts