---
title: The OASR and OABCL instruct respondents to base ratings on the previous 2 months. What if a form is to be readministered over intervals of less than 2 months?
description: "Answer: The 2-month instruction can be adjusted for shorter intervals. If the interval is shortened"
url: "https://answers.aseba.org/post/the-oasr-and-oabcl-instruct-respondents-to-base-ratings-on-the-previous-2-months-what-if-a-form-is-to-be-readministered-over-intervals-of-less-than-2-months/"
updated: "2024-01-29"
category: ASEBA Forms
tags:
  - "OABCL 60-99"
  - "OASR 60-99"
  - Older Adult Age Forms
---

# The OASR and OABCL instruct respondents to base ratings on the previous 2 months. What if a form is to be readministered over intervals of less than 2 months?

Answer: The 2-month instruction can be adjusted for shorter intervals. If the interval is shortened much below 2 months, this may slightly reduce scores on some problem items and scales. Low-frequency behaviors may also be missed if the rating interval is too short. However, if reassessments are planned at intervals of less than 2 months, respondents should use the same shortened interval for the initial ratings as well as for each follow-up rating. For example, if follow-up ratings are to be done after a 1-month interval, the initial ratings should also be based on a 1-month period, so that the initial scores will not be higher than the follow-up scores merely because they span a longer rating period. To allow time for changes to stabilize and to become clearly evident, reassessment intervals should generally span at least a month.