- In terms of the subjective comparison measures, PALs are likely to have the least correlated errors.

- Major sources of errors associated with questionnaires are due to the restricted list of activities, memory, and misinterpretation of questions. These sources of error are not typically shared by PALs which are open-ended and not reliant upon memory (activities are recorded as they occur).

- Disadvantages of PALs involve the fact that they rely heavily on subject motivation -they are time-consuming to complete. Completing them may also lead to heightened awareness which may alter normal activity. PALs also share error due to self report with questionnaires. For example, subjects are often prone to overestimate their activity.