Answer: Case study
Step-by-step explanation:
Case study is defined as the research carried out in deep manner to analyze and understand about any individual, event or situation. This mechanism is carried out through studying the subject in detailed manner, up-closed and structured examination, observing related consideration and facts etc.
According to the question, psychologist is conducting case study for studying about life of multi-racial families by conducting detailed interviews for understanding their life experiences, relation with co-worker, family of friends etc.