| PDACT stores files in a secure proprietary binary file format that can be compressed to a very small size. The questionnaire is executed linearly; one question per screen in a linear order but skips to and from markers in the questionnaire can be used to hide irrelevant detail. Many completed questionnaires can be stored on a single device and completed questionnaires cannot be re-displayed as a security precaution.
 Summary of PDACT features
- Proprietary binary file format (ensure data confidentiality)
- Compressed Palm database (PDB files)
(1-5 Kbytes per compressed questionnaire - average 200 questions)
- Questionnaire executed linearly, one screen at a time
- Can program in a range of data types (including GIS readings) as well as skips and `if then’ logic
- Store many questionnaires on a device
- Completed questionnaires cannot be retrieved (design feature)
Data Types that can be captured
- Free text data type questions
- Gender data type questions
- Date data types questions - Provide date picker ensuring that a
common date format is used consistently
- Single select list data type questions
- Multi-select list data type questions
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