An ad hoc study refers to a research project or investigation that is conducted on a specific, often urgent, basis. Unlike planned studies, ad hoc studies are not part of a larger, pre-determined research plan, but rather are initiated in response to a particular problem or question. This type of study is typically carried out with a sense of urgency and flexibility, as it aims to quickly gather information and provide insights into a specific issue. Ad hoc studies can be conducted by individuals, organizations, or governments, and can cover a wide range of topics, from market research to scientific experiments. The term ‘ad hoc’ is derived from Latin, meaning “for this purpose,” highlighting the temporary and specific nature of this type of study.