Whole Interval Recording       

What is whole interval recording?

Whole interval recording is one type of interval recording method. An interval recording strategy involves observing whether a behavior occurs or does not occur during specified time periods. Once the length of an observation session is identified, the time is broken down into smaller intervals that are all equal in length. For instance, a 10 minute observational session may be separated into 1 minute intervals with ten boxes that are used to record the occurrence of behavior. In whole interval recording, the observer marks down whether a behavior occurs throughout the entire interval by placing an "X" for occurrence and a "O" for no nonoccurrence.

Whole interval recording means that the observer is interested in behavior that occurs during the entire interval. Examples of ongoing behaviors that can be observed using whole interval recording include writing, walking, reading, or working on a given assignment.

Once the recording is complete, the observer counts the number of intervals in which behavior was observed and a percentage of intervals with the behavior is documented. For instance, a teacher may be interested in whether a student is on-task which has been defined as looking at the teacher while he is talking, talking to the teacher, or looking at the assignment. If these behaviors occurred throughout six of the ten intervals, then the student engaged in the behavior of interest during 60% of the observational session.

A stopwatch or wrist watch is often used to keep track of intervals with a clipboard holding a recording sheet. A tape recording with a sound indicating the end of an interval can also be used to alert the observer and help him or her keep track without having to spend time looking at a timing instrument.


What are the advantages and disadvantages of whole interval recording?

The advantage of the whole interval recording method is that it provides an estimate of the duration of a behavior and provides information about where behaviors are occurring or not occurring within an observational session. A major disadvantage of whole interval recording is that is requires an observer's undivided attention. Teachers interested in this measurement strategy may need to ask someone else to observe and collect whole interval data for them while they are working with students or engaged in instruction. Observing and recording data can be challenging, especially if using a stopwatch since the person recording must attend to both the timing of intervals as well as the student.

When should whole interval recording be used?

When the behavior that you are looking at is not easily counted, you can measure the behavior by counting the number of time-intervals in which the behavior occurred. A behavior is not easily counted when:

  • It is difficult to tell exactly when the behavior begins or when it ends, or
  • It occurs at such a high rate that it is difficult to keep count.

If you are interested in measuring ongoing behaviors that you know will continue across intervals, use the whole interval recording method.


Click here to view a whole interval recording example.

Before creating your own permanent product recording form click here to view a completed example.

Click here for a printable copy of the whole interval recording form.

Click here to print a blank whole interval recording form that can be used to collect your own data..

The University of Kansas prohibits discrimination on the basis of race, color, ethnicity, religion, sex, national origin, age, ancestry, disability, status as a veteran, sexual orientation, marital status, parental status, gender identity, gender expression, and genetic information in the university’s programs and activities. Retaliation is also prohibited by university policy. The following persons have been designated to handle inquiries regarding the nondiscrimination policies and are the Title IX coordinators for their respective campuses: Executive Director of the Office of Institutional Opportunity & Access, IOA@ku.edu, 1246 West Campus Road, Room 153A, Lawrence, KS 66045, 785-864-6414, 711 TTY (for the Lawrence, Edwards, Parsons, Yoder, and Topeka campuses); Director, Equal Opportunity Office, Mail Stop 7004, 4330 Shawnee Mission Parkway, Fairway, KS 66205, 913-588-8011, 711 TTY (for the Wichita, Salina, and Kansas City, Kansas, medical center campuses).