Final answer:
Professor Richland's study is an example of a self-study or autoethnography, a form of qualitative research that combines autobiography with ethnography.
Step-by-step explanation:
Professor Richland's study, where he provides a detailed account of his own personal thoughts and feelings while participating in recreational skydiving and managing his family and work responsibilities, is an example of a self-study or an autoethnography. This qualitative research method combines elements of autobiography and ethnography, allowing researchers to write about themselves and their experiences in a cultural context. By focusing on subjective experience, introspection, and personal narrative, such a study provides insight into the human aspect of phenomena, which can be particularly useful in fields like community psychology, sociology, and other social sciences.