Dr. Tom White created the Expression Manager (EM) system for LimeSurvey 1.92 and beyond. EM controls the majority of the survey-taking portion of LimeSurvey, including navigation, conditional branching, validation, and tailoring.
Expression Manager is a partial port of a Java-based survey system (Dialogix) that Dr. White built in 1999 to speed the development and deployment of complex epidemiological assessment and diagnostic instruments. At present, the main features which still need to be ported include:
More information about Dr. Tom White can be found here:
- Dialogix description: http://www.tomwhitemd.com/dialogix
- LinkedIn profile: http://www.linkedin.com/in/tomwhitemd