Free interval recording data sheet (partial, whole, momentary)
Use this sheet when a goal is scored as a percent of intervals, such as “engaged in at least 80% of 2-minute intervals.” The observation is split into equal intervals, each box is one interval, and you mark + or − by the goal's method.
Interval recording sheet
Momentary time sampling · 10 × 2-minute intervals
Student label:
Target:
Mastery rule:
Collection schedule:
Method:
Momentary time sampling
Data collector:
Key: + happening at the moment the interval ended · − not seen · blank = not observed (left out of the percent)
Swipe to see the whole sheet
Interval recording sheet
Date
Activity / context
1
2
3
4
5
6
7
8
9
10
# +
% of intervals+ ÷ scored × 100
Notes
Preview shows 6 of 15 rows.
Momentary time sampling: Look when the interval ends. Mark + if the behavior is happening at that moment.
Use a vibrating timer so every interval is the same length (2-minute).
Percent of intervals = + marks ÷ intervals scored (+ and −) × 100. Leave an interval blank if you couldn't observe it.
IEP Atlas Pro
Prefer tapping to paper?
This sheet runs live in the IEP Atlas workspace, on a tablet or phone. The graph updates as you go, and the progress report is drafted for you to edit.
Count trials, prompts, and minutes live in the session; the graph and trend line draw themselves; progress reports are drafted from your data.
Engagement or on-task goals over a long work period, where timing every moment isn't practical
Behaviors that happen too often or last too long to count one by one
Checking several students in turn (momentary time sampling suits this best)
How to use it
Set a vibrating timer (or the interval timer in the IEP Atlas workspace) to the interval length, and write the behavior's definition on the sheet.
Mark each interval by the method: partial (+ if it happened at any point), whole (+ only if it lasted the whole interval), or momentary (+ if it's happening when the interval ends).
Leave a box blank if you couldn't observe that interval. Percent = + marks ÷ intervals scored × 100; the CSV calculates it.
Questions
Which interval method should I use?
Momentary time sampling is easiest when you also teach, and it suits long periods and several students. Partial-interval recording tends to overestimate a behavior, so it fits behaviors you want to reduce. Whole-interval recording tends to underestimate, so it fits behaviors you want to grow, like staying engaged.
How long should each interval be?
Short intervals (10 to 30 seconds) give a closer estimate but need a dedicated observer. Longer intervals (1 to 5 minutes) fit a teacher who is also teaching. Keep the length the same every session so the percents compare.