Sophia, a market researcher at Contell Foods, is tasked with assessing the particular food tastes of the Hispanic population in the United States. Previously conducted surveys reveal that the company has failed to tap into the market for processed foods with respect to Hispanic Americans. As a part of Sophia's task, she is required to stay with 50 Hispanic American families and white American families over a period of 6 months and understand the difference in the food tastes, the cooking methods used, and the family culture prevalent in these families. Sophia is conducting _____ research.