Free Latency Data Sheet
A free printable latency data sheet for measuring response time. Log the instruction and the two clock times, or type into the fillable PDF, then export to Excel to subtract them and average the latency.
- Latency
- Free printable PDF
- Fillable in browser
A latency data sheet measures the gap between an instruction and the start of the response, which is the right measure when a learner can do the task but takes a long time to begin. Record the instruction or SD, the time it was delivered, and the time the response started, then note the latency between them. A learner who eventually complies but takes three minutes to start is showing a latency problem, not a skill deficit.
The clock discipline matters here. Note the SD time the moment the instruction is finished, and the response time the moment the learner begins, not when they finish. The difference is the latency for that trial. Because the window can be short, a phone timer often beats reading the wall clock twice, and a shared rule for what counts as the start of the response keeps observers aligned.
Across several trials, shrinking latency usually means an intervention is helping the learner respond sooner. Look at the trend rather than one long trial, since a single distraction can inflate a number. Export the rows to Excel when you want the sheet to subtract the times for you or to chart average latency across a week for the team.
When to use it
Use latency recording when the concern is how long it takes to start, not whether the learner can do the task, such as slow responses to directions or transitions. It suits BCBAs and teachers working on prompt-to-response delays and pairs with a plan to reduce that lag.
Customization tips
- Time the response from the start of the movement, not its completion, and say so on the sheet.
- Use a phone timer for short latencies where reading the clock twice is unreliable.
- Switch to the fillable PDF when staff would rather type the times.
- Export to Excel to subtract SD time from response time automatically and average the trials.
Frequently asked questions
- What is latency in behavior data?
- Latency is the time between an instruction, or SD, and the start of the response. It measures how quickly a learner begins, not how well they perform the task once they start. Long latency often points to a motivation or delay issue rather than a skill gap.
- How is latency different from duration?
- Latency times the gap before a behavior starts. Duration times how long the behavior lasts once it begins. They answer different questions, and some programs collect both when both the delay and the length matter.
- When would I measure latency?
- Measure latency when a learner can do a task but is slow to begin, such as taking a long time to follow a direction or start a transition. It is the fitting measure whenever the delay itself is the target of the plan.
- How do I record the times accurately?
- Mark the SD time when the instruction ends and the response time when the learner first begins to respond. A phone stopwatch helps for short gaps. Write down what counts as the start of a response so every observer measures the same moment.
- How do I summarize latency data?
- Average the latency across trials, or track the longest and shortest to see the range. The Excel export can subtract the two time columns for every trial and chart the average so a downward trend is easy to show.