Decision rules: the four-point rule and trend analysis

By the IEP Atlas editorial teamLast updated November 1, 2026

Short answer

The four-point rule says: if the 4 most recent consecutive data points all fall below the aimline, change instruction; if all 4 fall above it, consider raising the goal; if they fall on both sides, keep going. Trend analysis compares the slope of the student's trend line with the aimline after 6 to 8 points and leads to the same three choices.

A decision rule is an agreement, made before the data comes in, about what the graph has to show before you act. It keeps a team from changing course after one bad week or waiting until May to notice a goal stalled in October. The two rules most teams use are the four-point rule and trend analysis, and both are described by the National Center on Intensive Intervention as ways to judge progress against a goal line.^[1]^[3]

This guide shows how to apply both, with one fictional student and the time each step takes. For the full cycle around the rules, see the IEP progress monitoring pillar.

The rules in one table

Rule	What you check	Result	Decision
Four-point	The 4 most recent consecutive points	All 4 below the aimline	Change instruction
Four-point	The 4 most recent consecutive points	All 4 above the aimline	Consider raising the goal
Four-point	The 4 most recent consecutive points	Some above, some below or on	Continue; check after the next point
Trend	Slope of trend line vs aimline, 6 or more points	Trend flatter	Change instruction
Trend	Slope of trend line vs aimline, 6 or more points	Trend steeper	Consider raising the goal
Trend	Slope of trend line vs aimline, 6 or more points	About equal	Continue

The four-point rule is quick and works from week 4. Trend analysis needs more points but uses all of them, so it is less swayed by a short run of odd days. Many teams use the four-point rule early in the year and add the trend check once 6 to 8 points are on the graph.

What you need before you start

A baseline from at least 3 probes, with the median marked.
An aimline drawn from the baseline to the goal on its due date. The guide on graphing IEP data with aimlines covers this.
Probes on a fixed schedule, usually weekly, using the same task and conditions each time.
A team agreement on how to treat a point exactly on the aimline. Most teams count it as "not below," which breaks a run of four.

Step by step

Step 1: Read the last four points

After each new probe, look at the 4 most recent points. Ignore older ones for this rule. Example: the last 4 spelling probes are 36, 37, 37 and 38 correct letter sequences.

Step 2: Compare each with the aimline

Find the aimline value for each of those weeks and mark each point above, below or on. Example: aimline values 37, 38, 39 and 40. All four points are below.

Step 3: Apply the four-point decision

All four below: plan an instructional change. All four above: bring the data to the team and consider raising the goal. Mixed: continue. Write the decision and the date on the graph.

Step 4: Pick a real instructional change

A change has to be big enough to show up on the graph. Common options are more time, a smaller group, a more explicit method, more practice opportunities, or a different material. "Keep encouraging" is not a change. Mark the change with a labeled vertical line on the graph.

Step 5: Restart the count

Points before the change do not count toward the next decision. Wait for 4 new points after the change before applying the rule again.

Step 6: Add the trend check

Once 6 to 8 points sit in the current phase, draw a trend line and compare its slope with the aimline. If the four-point rule and the trend disagree, the trend usually deserves more weight because it uses more data.

Time each step takes

Step	Time	How often
Read the last four points	30 seconds	After each probe
Compare with the aimline	1 minute	After each probe
Apply the decision and note it	1 minute	After each probe
Choose and document a change	10 to 20 minutes, often with a colleague	When 4 points are below
Restart the count	None	After each change
Draw and compare a trend line	3 to 5 minutes	Every 4 weeks

Worked example: Nia's spelling goal

Nia is a fictional fourth grader. The numbers show the method, not a benchmark.

Goal: "Given 12 dictated words from grade 3 spelling patterns, Nia will write 66 correct letter sequences in a weekly probe by the annual review." Scored as correct letter sequences on the accuracy data sheet. Goal templates: spelling goals.

Baseline: 28, 30 and 33 correct letter sequences. Median 30. The goal is 36 weeks away, so the aimline rises 1 sequence per week: its value at any week is 30 plus the week number.

Weeks 1 to 6: mixed, so continue

Week	1	2	3	4	5	6
Aimline	31	32	33	34	35	36
Nia	31	33	32	35	34	37

At week 6, the last 4 points are 32 (below), 35 (above), 34 (below) and 37 (above). Mixed. Decision: continue.

Weeks 7 to 10: four below, so change instruction

Week	7	8	9	10
Aimline	37	38	39	40
Nia	36	37	37	38

Four consecutive points below the aimline. The gap is widening by about 1 sequence a week. Decision: change instruction. The teacher looks at the errors and sees most are vowel teams. She adds 10 minutes of explicit vowel-team instruction with word sorts, 4 days a week, and draws a labeled line at week 10.

Weeks 11 to 16: four above, then a steeper trend

Week	11	12	13	14	15	16
Aimline	41	42	43	44	45	46
Nia	41	43	44	46	47	49

Week 11 is on the line. Weeks 12 through 15 are four consecutive points above. At week 16, the trend line from the first two points (median 42 at week 11.5) to the last two (median 48 at week 15.5) has a slope of 6 divided by 4, or 1.5 sequences per week, steeper than the aimline's 1.0.

Both rules point the same way. The case manager brings the graph to an IEP team meeting, and the team raises the goal to 75 correct letter sequences. The new aimline runs from 49 at week 16 to 75 at week 36, or 1.3 per week. The next progress report says so in two sentences, as in the IEP progress report examples.

When the rules do not fit

Very bouncy data. If scores swing by more than the growth expected in a month, check the measure first. Are passages or word lists equal in difficulty? Is the probe the same length? Fix the measure, then apply the rule.
Goals with few data points. A rubric goal probed every other week takes 8 weeks to get 4 points. Use the rule, but expect slower decisions, and consider probing weekly if the skill allows.
Goals that should go down. For behaviors you want to reduce, "below the aimline" is good news. Flip the wording: 4 points above a downward aimline means change instruction.
Two changes with no response. If the student stays flat after two well-run changes, the question becomes the goal, the service or the need for more assessment. The team must revise the IEP to address a lack of expected progress.^[2] See what to do when a student is not making progress.

Common mistakes

Weak: Changing instruction after 2 low points. Better: Wait for 4 consecutive points below the aimline, unless safety is involved.
Weak: Counting points from before the last change. Better: Restart the count at each change line.
Weak: "Changed instruction" with no detail. Better: "Added 10 minutes of vowel-team sorts, 4 days a week, starting week 10."
Weak: Lowering the aimline when four points fall below it. Better: Change instruction. Only the IEP team changes the goal, and only after real changes have been tried.
Weak: Ignoring four points above the line because the student is "doing well." Better: Bring it to the team; a goal the student will pass in March is no longer a stretch.

Tools

Every decision rule depends on consistent probes. The measurement methods pages explain how to keep each unit the same from week to week, and the free IEP data sheets have space to note changes. The goal line glossary entry gives a quick definition to share with families.

Frequently asked questions

What is the four-point rule in progress monitoring?

It is a decision rule. Look at the 4 most recent consecutive data points. If all are below the aimline, change instruction. If all are above, consider raising the goal. If they are mixed, continue and check again after the next point.

Does a point on the aimline count as below or above?

Teams decide this ahead of time. Most treat a point exactly on the aimline as not below and not above, which breaks a run of four. Write your rule down so everyone applies it the same way.

Is the four-point rule or trend analysis better?

The four-point rule is faster and can be used after only 4 points. Trend analysis uses all the points in a phase, so it is steadier once you have 6 to 8. Many teams use both and give the trend more weight when they disagree.

Do I need an IEP meeting to change instruction?

Usually not, if the change fits within the services and supports already in the IEP, such as a new method or materials. Changing the goal, the service minutes or the setting requires the IEP team.

Use it in IEP Atlas

Sources

Progress Monitoring: Data & Goal Setting, National Center on Intensive Intervention
34 CFR §300.324: Development, review, and revision of IEP, Legal Information Institute, Cornell Law School
Decision Rules for Analyzing Academic Progress Monitoring Data, National Center on Intensive Intervention

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.