They propose that researchers may be able to use a controlled stimuli that have accounted appraisal criteria to induce particular emotions in animals and gather which types of basic emotions non-human animals can experience.

A few appraisal criteria to keep in mind for a legally sound PA is to keep the content of the appraisal objective, job-related, behavior-based, within the control of the ratee, and related to specific functions rather than a global assessment.