The Most Common Data Mistake in Schools

Across the country, schools are collecting more data than ever:

• Benchmark assessments
• Universal screeners
• Progress monitoring tools

But here’s the problem:

Many schools are using the wrong data to make instructional decisions.

They rely heavily on benchmark data…
…and skip the step that actually tells teachers what to teach.

The Result?

• Instruction remains too broad
• Small groups lack focus
• Interventions miss the mark
• Students don’t accelerate

The Root Cause

A misunderstanding of one critical distinction:

Diagnostic vs. Benchmark Assessments

What Is a Benchmark Assessment?

Benchmark assessments (also called universal screeners) are designed to:

Identify which students are at risk and measure overall performance levels.

Examples of Benchmark Assessments:

• Acadience (DIBELS)
• i-Ready Diagnostic (as a screener view)
• MAP assessments

What Benchmark Data Tells You:

• Who is at/above/below benchmark
• Overall performance trends
• Which grade levels need support

What Benchmark Data Does NOT Tell You:

• Why students are struggling
• What specific skill is missing
• What to teach next

Benchmark data identifies the problem—but not the solution.

What Is a Diagnostic Assessment?

Diagnostic assessments are designed to:

Pinpoint the exact skill gaps causing a student’s difficulty.

Examples of Diagnostic Assessments:

• Phonological awareness assessments (e.g., PAST)
• CORE Phonics Survey
• Decoding inventories
• Fluency diagnostics
• Comprehension assessments

What Diagnostic Data Tells You:

• Specific skill deficits
• Instructional starting point
• Root cause of reading difficulty

Diagnostic data tells you exactly what to teach.

The Critical Difference

Why This Distinction Matters More Than Ever

Many schools are making this mistake:

Using benchmark data to plan instruction.

What That Looks Like:

• “Students are below benchmark → put them in intervention”
• “Scores are low → increase time”

What’s Missing:

• Skill precision
• Targeted instruction
• Clear next steps

Without diagnostics, instruction becomes guesswork.

The Right Way to Use Both Assessments

High-performing schools don’t choose one, they use both strategically.

Step 1: Use Benchmark Assessments to Identify Who Needs Support

Ask:

• Who is at risk?
• Which students need further analysis?

Step 2: Use Diagnostic Assessments to Identify What They Need

Ask:

• What skill is missing?
• Where should instruction begin?

Step 3: Align Instruction to Diagnostic Data

Now instruction becomes:

• Targeted
• Explicit
• Efficient

Step 4: Use Progress Monitoring to Track Growth

• Monitor the specific skill being taught
• Adjust instruction as needed

What This Looks Like in Practice

Ineffective Approach:

• Benchmark shows student is below grade level
• Student placed in general intervention group
• Instruction remains broad

Effective Approach:

• Benchmark identifies student at risk
• Diagnostic reveals: student cannot segment phonemes
• Instruction targets phoneme segmentation
• Progress monitored weekly

Now growth is possible and measurable.

How This Impacts Small Group Instruction

Without diagnostics:

• Groups are based on levels
• Instruction is inconsistent
• Students don’t progress efficiently

With diagnostics:

• Groups are skill-based
• Instruction is targeted
• Growth accelerates

The Role of MTSS in Assessment

MTSS depends on this alignment:

Tier 1:

• Benchmark data identifies trends
• Instruction adjusted for whole group

Tier 2:

• Diagnostic data drives small group instruction
• Targeted intervention begins

Tier 3:

• Intensive diagnostics guide individualized support
• Progress monitored frequently

Without diagnostics, MTSS cannot function effectively.

The Leadership Mistake to Avoid

Many leaders ask:

“What do the benchmark scores say?”

But the better question is:

“What do students need and how do we know?”

What High-Performing Schools Do Differently

They:

✔ Use benchmark data as a starting point
✔ Use diagnostics to drive instruction
✔ Align small groups to skill gaps
✔ Monitor progress frequently
✔ Adjust instruction in real time

The Impact: What Happens When Schools Get This Right

When benchmark and diagnostic assessments are used correctly:

✔ Instruction becomes precise
✔ Teachers know exactly what to teach
✔ Small groups become effective
✔ Intervention accelerates learning
✔ Student outcomes improve significantly

Real Results We See

• Faster foundational skill development
• Increased reading fluency
• Stronger comprehension
• More students reaching benchmark

Because instruction is aligned to need.

The Bottom Line: Assessment Should Drive Action

Let’s be clear:

Benchmark assessments tell you who needs help.
Diagnostic assessments tell you how to help them.

Final Thought: The Question That Changes Everything

The most effective schools don’t ask:

“How did students perform?”

They ask:

“What are we going to teach next and why?”