Wide format is a common way of organizing intensive longitudinal data, or data gathered using an Experience Sampling Method (ESM). This configuration allows for multilevel modeling in common statistical programs. Each session is organized in a separate row, with prompts and other information organized by column within that row. (By comparison, long format datasets provide more detailed information about every response by listing the prompt response and other information about that response in a row.) For more information about the differences between long and wide format, please see this article).
(Note: The use of the terms long and wide format for intensive longitudinal studies varies across studies. For more information, please see this article.)