The flow of data to and from the archive data files. Computerization of data from paper data forms, or data entry, is achieved by the use of text editors, and data entry programs. The use of data entry programs is preferred because it allows for the verification of field inputs with the documentation for those fields. The data are double entered or visually checked, then summary analyses produced for additional quality assurance checks. Once the data are in the archive area they are then accessible to the investigators via electronic network.
Access is provided through a World Wide Web interface.
Equipment investments to support this level of DFMS for a long term project must be made with a great deal of forethought and commitment. The system described above is implemented on a cluster of UNIX workstations, a UNIX file server, and a number of associated MS Windows and Macintosh computers. Depending on data volume, this system could be implemented on a PC or Mac network as well, the tools are generic in application.