Abstract: A method of collecting, monitoring and comparing data in a multi-variable, multi-participant clinical analysis system and integrating the collection and monitoring with a thesaurus database is disclosed. The method utilizes one or more computer-based units for collecting, validating, integrating and storing the integrated data from multiple participants in a clinical study. The method also utilizes a remote main computer system connected to the computer-based collection units for receiving the uploaded integrated data from the collection unit for further processing and downloading new or modified data and collection instructions to the remote collection units with software and interfacing apparatus cooperating for downloading and inputting new or updated data, the collection units and the main computer being synchronized so that the data in all the connected units is the same.