Fill in the blank with correct active or passive verb form in the bracket my colleagues A, B, and I (design) an experiment to test the impact on worker perceptions of well being when domesticated cats (allow) to freely roam various work environments in which the subjects were normally employed. There test environments (select) for our experiments: a law office, a laboratory in which experiments (perform) using laboratory rats, and an automobile assembly line. One-way mirrored glass pannels (install) to allow video cameras to record the activity and researchers to observe the same and take notes. We secretly inserted observers directly into the work environment. These observers posed as outside contractors and (uniform) as a maintenance and cleaning staff, coffee and water service vendors, and similar suporting personnel. The observers (draw) from the students who(matriculate) into the experimental psychology courses from which this study(develop) as an example of such studies generally. ​