About Comprehensive Assessment Services

Comprehensive Assessment Services (CAS) provides independent educational evaluations (IEEs) across California. Founded and directed by Donald Ghrist, LEP, CAS brings over 25 years of experience serving students, parents, and districts through accurate and compassionate assessment.

Our mission is simple — to ensure every student’s unique strengths and needs are fully understood through evidence-based evaluation, standardized clinical data, and professional insight.

Whether navigating complex learning differences, dyslexia, autism, behavioral concerns, or communication barriers, CAS provides impartial, legally defensible assessments designed to bring consensus and clarity to the IEP table.

Clinical Quick Facts

  • Statewide Coverage: Serving school districts and families across all of California (in-person & virtual)
  • Direct Leadership: Led by Licensed Educational Psychologist Donald Ghrist, LEP #2703 / #3476
  • Complete Independence: Impartial, unbiased assessments focused strictly on student needs
  • Timely Reporting: Standard 30-day report delivery following testing completion
  • Direct Phone Support: Call our team directly at (661) 743-9600

Why Choose CAS

CAS has earned trust throughout California school districts through clinical integrity, measurement precision, and student-centered compassion. Our evaluations meet all state and federal standards, providing clarity and actionable insight for every IEP team.

Objective Evaluations

Completely independent — serving the student, not an agenda. Findings are grounded strictly in standardized data, clinical observation, and professional ethics.

Fast Turnaround

Reports are delivered within 30 days of testing completion to ensure IEP teams can meet statutory deadlines without unnecessary delay.

Statewide Service

Flexible in-person assessment and secure tele-assessment options available across Southern, Central, and Northern California.

Multidisciplinary Expertise

Comprehensive evaluations covering cognitive processing, executive functioning, speech-language, motor skills, and behavioral health.

Evaluation Disciplines

CAS offers specialized evaluations across all core educational disciplines, each conducted by licensed, credentialed specialists with extensive public school assessment experience.

Psychoeducational

Academic achievement, cognitive processing, executive functioning, attention (ADHD), memory, dyslexia, and social-emotional profiles.

Speech & Language (SLP)

Receptive/expressive language, social pragmatics, articulation, fluency, and voice communication development.

Occupational Therapy (OT)

Fine motor coordination, sensory processing, visual-motor integration, and classroom functional participation.

Physical Therapy (PT)

Gross motor mobility, strength, balance, and physical accessibility within school learning environments.

Adapted PE (APE)

Physical education participation, motor coordination, fundamental movement skills, and curriculum adaptations.

Our Evaluation Process

1. Request & Agreement

Parents or districts submit a referral or signed IEE agreement. CAS confirms requested disciplines, scopes the assessment plan, and initiates coordination.

2. Testing & Observations

Standardized diagnostic sessions are scheduled with the student, accompanied by classroom observation, teacher/parent rating scales, and clinical interviews.

3. Report & Feedback

A comprehensive, written report with concrete educational recommendations is delivered within 30 days, followed by attendance at the IEP team meeting.

Turnaround Guarantee: Most evaluations are completed within 30 days of testing — ensuring prompt, reliable insights for parents and IEP teams.

Frequently Asked Questions

Who can request an Independent Educational Evaluation (IEE)?

Under IDEA and California Education Code, parents or legal guardians have the right to request an IEE at public expense whenever they disagree with an assessment conducted by their school district.

How long does the evaluation process take?

CAS delivers completed written evaluation reports within 30 calendar days following the final testing session, allowing IEP teams to convene promptly.

Does CAS serve my school district?

Yes. CAS provides statewide coverage across all 58 California counties, coordinating both in-person testing at convenient regional sites and secure virtual assessments.

Are CAS reports accepted by California school districts?

Yes. All CAS evaluations are conducted by fully licensed professionals (LEP, SLP, OTR/L, PT, APE) and strictly comply with state and federal special education assessment guidelines.

Ready to Begin?

If you are a parent, educational advocate, attorney, or school district administrator seeking an independent educational evaluation, CAS is ready to assist.

Start Your Request → 📞 Call (661) 743-9600 Send a Message