- PAT: Punctuation and Grammar
- PATH Personality Questionnaire Version 2
- Patterns of Adaptive Learning Scales (PALS)
- Peabody Individual Achievement Test (PIAT)
- Peabody Picture Vocabulary Test [PPVT]
- Peabody Picture Vocabulary Test – IV (PPVT)
- Pennies Story Problems (Jordan & Hanich)
- Perceived Parenting Style Scale
- Perceived Stress Scale
- Petrill Educational Progress Survey
- Phelps Kindergarten Readiness Scale [2012 Restandardization]
- Phonological and Print Awareness Scale
- Phonological Awareness Literacy Screening [PALS]
- PLS-5 Spanish
- Positive and Negative Affect Scale (PANAS)
- Practical Adolescent Dual Diagnostic Interview-5
- Pragmatic Language Observation Scale
- PREPARE/ENRICH: Online Customized Version
- Preschool Early Numeracy Scale [PENS]
- Primary Test of Nonverbal Intelligence [PTONI]
- Program Administration Scale
- PTSD and Suicide Screener
- Qualitative Reading Inventory [QRI]
- Quality of Survey Studies in Psychology Checklist (Q-SSP)
- Reading Motivation Scale
- Reading Self-Concept Scale: Attitude
- Reading Self-Concept Scale: Competence
- Reading Self-Concept Scale: Difficulty
- Researcher Developed Assessment
- Researcher-developed expository text comprehension test (pretest & posttest)
- Revised Child Anxiety and Depression Scale (RCADS)
- Revised IDEA Feedback for Administrators System
- Revised IDEA Feedback for Department Chairs System
- Revised NEO Personality Inventory UK Edition
- Reynolds Adaptable Intelligence Test
- Rivermead Behavioural Memory Test Third Edition
- Riverside Early Assessments of Learning
- Roll Evaluation of Activities of Life
- Rosenberg Self-Esteem Scale
- Ross Information Processing Assessment-Geriatric Second Edition
- ROWPVT-SBE
- SALT Narrative Story Retell
- Scales for Assessing Emotional Disturbance Second Edition
- Scales for Rating the Behavioral Characteristics of Superior Students Third Edition
- Scales of Cognitive and Communicative Ability for Neurorehabilitation
- School Behaviours Rating Scale
- School Readiness Test
- School Reported Grades
- Science: Thinking with Evidence
- Screening instruments (Slosson Intelligence Scale
