Step 1: Understanding Diagnostics
What Are Diagnostic Assessments?
Diagnostic assessments are targeted tools used to identify the specific foundational reading skills that a student has not yet mastered. Unlike benchmark tests (which tell you if a student is on track), diagnostics help determine why a student is struggling.
“Many children appear to be proficient readers until around third grade, when text becomes more complex, and picture cues disappear. Suddenly, comprehension breaks down, revealing gaps in phonemic awareness, decoding, or language comprehension.” – Reading Rev
Why Diagnostics Are Crucial
- They uncover the root causes of reading difficulties.
- They prevent wasted instructional time by pinpointing exact areas of need.
- They help teachers plan precise, skill-based interventions.
- They provide early detection of reading disabilities, including dyslexia.
Without diagnostics, we’re guessing. With them, we’re teaching.
Step 2: When and How to Use Diagnostics
Step 3: Recommended Diagnostic Tools
- PAST (Phonological Awareness Screening Test)
- Used For: K-2 struggling readers, students with decoding difficulty, and older readers with word-level gaps
- Measures: Sentence segmentation, rhyming, onset-rime, syllables, phoneme isolation, and manipulation
- Why Use It: 80% of students with reading disabilities have a phonological processing deficit (Kilpatrick, 2015)
- How to Use: Identify the level of phonological awareness and design targeted oral language activities using Equipped for Reading Success
- Versions:
- Primary PAST: Start with students who struggle with rhyme or syllables
- Advanced PAST: Use for more proficient students to assess complex phoneme manipulation
- CORE Phonics Survey
- Used For: Grades K-5+, students who struggle to decode words
- Measures: Letter names/sounds, short vowels, digraphs, blends, vowel patterns, and multisyllabic decoding
- Why Use It: Pinpoints specific phonics gaps and helps track skill mastery over time
- How to Use: Teach identified phonics patterns in small groups, using both real and nonsense words
- 6 Syllable Types Plus!
- Used For: Intermediate struggling readers (Grades 3-8)
- Measures: Mastery of syllable types, spelling patterns, multisyllabic word reading, irregular word recognition
- Why Use It: Distinguishes between pattern memorization and actual phonics mastery
- How to Use: Use results to create multisyllabic decoding lessons aligned with morphology instruction
- Developmental Word Knowledge Inventory
- Used For: Grades 2-8, especially students with accurate reading but poor spelling
- Measures: Spelling stages, phonetic, transitional, and fluent
- Why Use It: Spelling is often the “red flag” for phonics and phonological weaknesses
- How to Use: Plan encoding (spelling) lessons aligned to phonics stage. Prioritize dictation and word building.
- Multisyllabic Word Inventory
- Used For: Students who decode single syllable words but struggle with longer words
- Measures: Decoding/encoding of multisyllabic words
- Why Use It: Targets the skill that often prevents intermediate readers from progressing
- How to Use: Integrate with morphology instruction (prefixes, roots, suffixes) for fluency and vocabulary growth
- Morphology Assessment
- Used For: Grades 3-8, struggling with vocabulary or complex text
- Measures: Knowledge of 42 common morphemes (prefixes, roots, suffixes)
- Why Use It: Morphological awareness boosts both decoding and comprehension
- How to Use: Teach word parts explicitly; integrate with writing and vocabulary instruction
Step 4: How to Use Diagnostic Data in MTSS
Tier 1 Instruction
- Core, universal instruction
- Differentiated small group instruction during ELA block
- Scaffold using diagnostic data: add oral language routines, decoding drills, dictation
Tier 2 Small Group Intervention
- Who: Students slightly below grade level or flagged by benchmark + diagnostic data
- What: Skill-based groups (4-6 students), 20-30 minutes, 3-5x/week
- Focus: One to two high-leverage skills (e.g., CVC words, digraphs, blends, phoneme manipulation)
- Use: PAST, CORE Phonics Survey, Word Inventory
- Instructional Tools: UFLI, Bridge the Gap, Heggerty, decodable readers
Tier 3 Intensive Intervention
- Who: Well below benchmark or non-responsive to Tier 2
- What: Very small group or 1:1, 30-45 minutes, 5x/week
- Focus: Phonological awareness + decoding/encoding using diagnostic data
- Use: PAST, Multisyllabic Inventory, Morphology Assessment
- Instructional Tools: Orton-Gillingham-based programs, PAF materials, S.P.I.R.E
Step 5: Narrowing and Closing Achievement Gaps
- Start with Precision: Use diagnostics, not assumptions.
- Target Gaps: Design instruction around what students don’t know yet, not what they’ve already learned.
- Track Progress: Reassess every 4-6 weeks using original diagnostic to track mastery.
- Make It Stick: Use explicit, systematic instruction with ample practice and immediate feedback.
- Layer Support: Don’t wait to move students through tiers, intervene early and often.
Diagnostic assessments are the missing puzzle piece in reading instruction. They empower teachers to make smart, data-informed decisions and finally answer the question: “Why is this child struggling?”
“Just telling older students to ‘read more’ won’t work. They need and deserve explicit instruction in the foundational skills they missed.”
Use this guide to build a classroom culture that prioritizes equity, precision, and progress for every reader.