It's For that reason often called a "naturalistic" design; This is often in contrast to an "experimental" style (for instance a randomised controlled trial) during which the investigator seeks to exert control more than and manipulate the variable(s) of curiosity. Case study is often blended with other methodologies, like https://landenoojzy.yomoblog.com/35466618/considerations-to-know-about-darden-case-solutions