In order to determine if his uncle is a psychopath, Jerry interviews his uncle, who has a long ...

In order to determine if his uncle is a psychopath, Jerry interviews his uncle, who has a long criminal record. He compares the interview with other corroborating information (e.g. police reports, interviews with other family members and friends, etc), and applies the information to the Psychopathy Checklist-Revised (a well-known 20-item scale for measuring psychopathy developed by a criminologist). In using a scale to determine whether his uncle is a psychopath, Jerry is studying ____________.
 
  a. direct observables
  b. indirect observables
  c. constructs
  d. concepts
  e. conceptualization