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TExES Educational Diagnostician-153 (153) Resources
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Understanding the exact breakdown of the TExES Educational Diagnostician-153 test will help you know what to expect and how to most effectively prepare. The TExES Educational Diagnostician-153 has 100 multiple-choice questions . The exam will be broken down into the sections below:
| TExES Educational Diagnostician-153 Exam Blueprint | |||
|---|---|---|---|
| Domain Name | % | Number of Questions |
|
| Students with Disabilities | 22% | 22 | |
| Assessment and Evaluation | 33% | 33 | |
| Curriculum and Instruction | 22% | 22 | |
| Foundations and Professional Roles and Responsibilities | 22% | 22 | |
| *Percentages do not add up to 100 due to rounding. | |||
TExES Educational Diagnostician-153 Study Tips by Domain
- Differentiate disability under IDEA from “eligibility needs” under Section 504—red flag: assuming a medical diagnosis alone automatically qualifies a student for special education.
- Match suspected disability category to required evaluation components (e.g., SLD needs data-based documentation of insufficient progress)—common trap: relying on one test score instead of converging evidence across sources.
- Apply LRE decisions on a continuum of services with documented supplementary aids and services—priority rule: start with general education supports before moving to more restrictive settings.
- Identify high-incidence vs. low-incidence disabilities and likely instructional implications (e.g., ASD needs explicit social-communication supports)—red flag: writing goals that describe services rather than measurable student outcomes.
- Distinguish language difference from disability, especially for emergent bilingual students—common trap: interpreting limited English proficiency as a learning disability without appropriate language proficiency data.
- Recognize disability-specific risk factors and contraindications (e.g., sensory impairments require accessible materials and accommodations)—red flag: providing accommodations that change the construct being measured on an assessment.
- Use multiple sources (records, interviews, observation, norm-referenced and criterion-referenced data) to answer the referral question; red flag: making eligibility decisions from a single test score.
- Verify validity of results by checking standardization conditions, rapport, language needs, and behavioral observations; common trap: ignoring deviations (fatigue, inattention, poor effort) that invalidate interpretation.
- Interpret scores correctly (standard scores, percentiles, confidence intervals, SEM) and relate them to educational impact; priority rule: never treat percentile ranks as equal-interval or average them across tests.
- Ensure assessment is nondiscriminatory and appropriate (native language, cultural/linguistic factors, accessible formats); red flag: selecting instruments outside a student’s language proficiency and then attributing low scores to disability.
- Link evaluation findings to specific present levels, needs, and measurable IEP recommendations; common trap: writing generic recommendations not tied to the student’s data and observed skill deficits.
- Follow legal/ethical timelines and documentation for referral, consent, reevaluation, and parent communication; priority rule: do not begin formal evaluation without informed consent and properly documented procedural safeguards.
- Use assessment data to select targeted, evidence-based interventions matched to the student’s present levels; red flag: choosing a program because it’s available rather than because it addresses the verified skill deficit.
- Align IEP goals to TEKS and grade-level expectations with appropriate access supports; common trap: writing goals that mirror the curriculum pacing guide instead of measurable skill statements.
- Differentiate between accommodations, modifications, and specially designed instruction (SDI) and document the correct one; priority rule: accommodations change how learning is accessed, not what is taught.
- Plan instruction using explicit, systematic teaching with guided practice and cumulative review when data show persistent skill gaps; red flag: overreliance on independent work for students who have not yet demonstrated mastery.
- Embed progress-monitoring into instruction and adjust intensity (time, group size, explicitness) when the trend line is flat; threshold cue: if multiple data points show minimal growth, change the intervention rather than extending the same plan.
- Ensure behavior and social-emotional supports are instructionally linked (e.g., teach replacement behaviors) when behavior interferes with learning; common trap: using consequences alone without direct instruction in the needed skill.
- Apply IDEA requirements to evaluation and eligibility decisions—red flag: predetermination (deciding eligibility before collecting and reviewing data) can invalidate the process.
- Follow procedural safeguards (prior written notice, consent, independent educational evaluation rights, and timelines)—common trap: treating parental consent for evaluation as consent for initial special education services.
- Maintain confidentiality under FERPA/IDEA and district policy—priority rule: share personally identifiable information only with staff who have a legitimate educational interest and document releases.
- Ensure nondiscriminatory practices in referrals and evaluations—red flag: relying on a single measure or using tools not validated for the student’s language, culture, or disability-related access needs.
- Use evidence-based ethical decision-making and avoid dual roles—common trap: acting as both evaluator and advocate in a way that biases conclusions or pressures the ARD/IEP team.
- Collaborate effectively on ARD/IEP teams with clear professional boundaries—priority cue: recommendations must link directly to data and educational need, not to desired placements or available programs.
- Ignore the asterisked note when planning study time; it is not a content domain and won’t generate standalone test questions—red flag: trying to memorize “rounding rules” as if they were standards.
- Use the note to interpret the framework correctly: domain weights are approximate and may total 99% or 101%—common trap: concluding a subarea is missing because the math doesn’t sum to 100.
- When prioritizing prep, follow the published percentage ranges rather than forcing exact totals—priority rule: allocate time by relative weight, not by a recalculated “corrected” percentage.
- For practice-test debriefs, don’t expect the number of items per domain to match the posted percentages exactly—common trap: assuming a fixed item count implies a scoring or blueprint error.
- If you see a domain-total mismatch on study materials or score reports, treat it as rounding unless other evidence suggests a problem—red flag: reporting an “error” based solely on 1% variance.
- Keep focus on the actual domains (Assessment and Evaluation, Curriculum and Instruction, Foundations and Professional Roles and Responsibilities, Students with Disabilities)—priority rule: skip any prep source that builds content objectives from the rounding disclaimer.
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TExES Educational Diagnostician-153 Aliases Test Name
Here is a list of alternative names used for this exam.
- TExES Educational Diagnostician-153
- TExES Educational Diagnostician-153 test
- TExES Educational Diagnostician-153 Certification Test
- TEXES
- TEXES 153
- 153 test
- TExES Educational Diagnostician-153 (153)
- TExES Educational Diagnostician-153 certification
