Why "80% accuracy" is often the wrong criterion

By the IEP Atlas editorial teamLast updated November 1, 2026

Short answer

No law or research sets 80% accuracy as the IEP standard. It is a habit. It fits some skills, but it is too low for safety skills, too easy when the baseline is already near it, and blind to speed. Set the criterion from the student's baseline, the skill's real-world demand and the number of items on each probe.

Open any goal bank and count the goals that end in "with 80% accuracy." It is often most of them. The number feels safe because everyone uses it. That is the problem: a criterion copied from habit says nothing about this student.

Federal rules ask for measurable annual goals and a statement of how progress will be measured.^[1] They do not name a percentage. Neither does any rule we know of at the federal level. The 80% figure is a convention, and like any convention it works in some places and misfires in others. The pillar guide on how to write IEP goals covers the full method; this page is about the number.

A scenario: Jada and the 80% goal that was met in October

Jada is a fictional 3rd grader. Her IEP from last spring has this math goal: "Jada will add two-digit numbers with regrouping with 80% accuracy." There is no baseline in present levels.

Her new teacher gives a 10-problem probe each Friday and records the results on an accuracy data sheet:

Date	Problems correct	Total problems	Percent accuracy	Time to finish
Sep 12	7	10	70%	14 minutes
Sep 19	8	10	80%	12 minutes
Sep 26	7	10	70%	15 minutes
Oct 3	9	10	90%	13 minutes
Oct 10	8	10	80%	12 minutes

By the second week of October, Jada has hit 80% on three of five probes. On paper the goal is nearly met. In class she still finishes about half of the addition work in the time given.

Three things went wrong:

No baseline. Jada was already near 80% in September. The goal asked for almost no growth.
The wrong unit. Accuracy was never Jada's problem. Speed was. She takes 12 to 15 minutes for 10 problems that classmates finish in 5.
Too few items. On a 10-item probe, one careless error moves the score by 10 points. A swing from 70% to 90% can be two problems, not two weeks of learning.

What the team wrote instead

The team kept addition with regrouping as the skill but changed the unit to digits correct per minute. Three 2-minute probes in October gave a median of 11 digits correct per minute. The new goal targets 24 digits correct per minute in 3 of 4 consecutive weekly probes, with accuracy reported alongside. It now measures what is actually holding her back.

When 80% accuracy does fit

The number itself is not wrong. It fits when three things are true:

The baseline is well below it, such as 30% or 40%.
Accuracy, not speed or independence, is the real barrier.
Each probe has enough items that one error moves the score by 5 points or less, so 20 items or more. With 10 items, pair the percentage with a consistency rule across several probes.

A percent accuracy criterion on a 20-word spelling list for a student at 35% can be a sound goal. The same criterion on a street-crossing routine is not.

Better criteria by situation

Situation	Why 80% misfires	Better criterion
Safety skills (crossing, staying with group)	Failing 1 in 5 times is dangerous	100% of steps, across 4 of 5 crossings
Baseline already 70% or more	Asks for almost no growth	Raise the target, or change to rate or a harder condition
Fluency skills (facts, reading, letter sounds)	Accurate but slow still fails in class	Correct per minute
Behavior that depends on a situation	Percent of what?	4 of 5 opportunities
Writing quality	Percent correct does not fit a paragraph	Rubric points, such as 9 of 12
Steps of a routine	One missed step can matter more than others	Steps completed independently, such as 8 of 9
Very hard skill, low baseline (10%)	80% in one year may be unreachable	Set from growth, such as 50%, and review at 9 weeks

Rules and practice: what is fixed and what varies

Question	Federal rule	Where practice or states differ
Is a percentage required?	No; goals must be measurable^[1]	Some district forms default to a percent field
Is 80% the standard?	No standard is named	Many goal banks repeat it by habit
Are short-term objectives required?	Only for students on alternate assessments aligned to alternate standards^[1]	Some states require them for every student
How often must progress be reported?	The IEP states when; often with report cards^[1]	Schedules and report formats vary by state and district
Who picks the criterion?	The IEP team, including the parents^[2]	Some districts review goals centrally

Check your state's IEP manual for local requirements. This is general information, not legal advice.

How to measure an accuracy goal well

If percent accuracy is the right unit, make it count:

Fix the item count. Use the same number of items on every probe and write the denominator in the goal, such as "on 20 dictated words."
Probe weekly or every two weeks. Weekly probes give you 8 to 9 data points by the first progress report, enough to see a trend.
Use new items. Rotate equivalent forms so the student is not memorizing one list.
Record time too. A column for minutes on task costs nothing and shows whether accuracy is coming at the price of speed.
Graph it. A table of percents is hard to read. A line graph with a goal line shows in seconds whether the student is on track.

The percent accuracy measurement guide explains scoring rules and when to switch to a different unit.

A quick test for any criterion

Before you keep a criterion, answer three questions:

What is the baseline, in the same unit?
If the student met this number, would the problem in class be solved?
Could one bad item or one good day meet it by accident?

If the answers are "I don't know," "no" and "yes," change the criterion. The IEP mastery criteria page covers the consistency half of the decision, such as 3 of 4 probes, and the IEP goal formula shows where the criterion sits in the sentence. For setting the number itself, see setting a realistic annual target.

Frequently asked questions

Why do so many IEP goals use 80% accuracy?

Mostly habit and copying from goal banks. The number sounds like a solid B and needs no data to pick. It is not required by federal rules, and it often does not match the student's baseline or the skill's real-world demand.

Is 80% accuracy ever a good IEP criterion?

Yes, when the baseline is well below 80%, accuracy is the real barrier, and each probe has enough items that one error does not swing the score much. It fits many academic skills scored item by item, such as spelling or computation accuracy.

What should a safety goal criterion be?

Usually 100% of the critical steps, met across several real trials. A student who crosses the street correctly 4 times out of 5 is still unsafe on the fifth crossing. Measure safety skills with a task analysis of each step.

Use it in IEP Atlas

Sources

34 CFR §300.320: Definition of individualized education program, Legal Information Institute, Cornell Law School
34 CFR §300.321: IEP Team, U.S. Department of Education (IDEA website)

Written and checked by the IEP Atlas editorial team under our editorial policy. This guide describes general practice and federal rules. It is not legal advice; your state may add requirements, and the IEP team makes the decisions for each student.