Which measurement method records, at specific time points, whether each individual in a group is engaged in the target behavior, providing a measure of group behavior?

• A. PlacCHECK
• B. Partial Interval Recording
• C. Phylogeny
• D. Parametric Analysis

Answer: (A)

PlacCHECK, or Planned Activity Check, is a group-level observation method in which you preselect specific moments and, at each moment, check every group member to see if they are engaged in the target behavior. The data you collect are the number or proportion of individuals engaged at those fixed time points, giving a clear measure of how the group is performing as a whole. This exactly matches the idea of recording at specific time points for each person and producing a group behavior metric. Partial Interval Recording does not provide a snapshot of each person at fixed moments; it notes whether the behavior occurred at any time during the interval, which can inflate estimates and doesn’t capture per-person status at specific moments. Phylogeny and Parametric Analysis refer to evolutionary history and dose–response exploration, respectively, and are not measurement methods for group behavior in this way.