Data Collection Modules
The QDS Questionnaire Development System is a complete system for developing and administering data collection applications. QDS enables you to: produce all materials needed to administer a questionnaire or complete a form from a single set of specifications and easily reuse field-tested questions by copying specifications between questionnaires.
The QDS system consists of several components, or Modules. A module is one of the components, or executable programs (*.EXE), that make up the Questionnaire Development System.
The first step in creating a QDS application is to define questionnaire specifications in the Design Studio. Your specifications include all content and settings for your questionnairee.g., question text, instructions, branching instructions, consistency checks.
These specifications make up the Specifications File used by the Design Studio to build a QDS Control File. The control file is used by the Data Collection Modules to administer your data collection application.
The Design Studio is also used to build instrument documentation, including hard-copy questionnaires (self- or interviewer-administered), an Analytical Codebook, and a log of all changes made to your Specifications File (Change History).
Data Collection Modules
QDS supports both manual and computer-administered data collection. Each type of data collectionData Entry, ACASI, CAPI, and QDS-Web™is associated with its own data collection module.
The data collection modules use the QDS Control File created by the Design Studio to administer your questionnaire.
The Data Collection modules create data files in a binary file format that may be converted to a flat ASCII file using the Questionnaire Data to ASCII conversion utility (QDA.EXE) or exported to SAS, SPSS, Stata, or MS Access using the QDS Warehouse Manager.
Data Entry Module
Once data are collected/recorded using one or more of the Data Collection modules, you may import the data into the Warehouse Manager for data management and export data for analysis.
The Warehouse Manager allows you to track the status of collected data and, for multisite studies, whether each completed questionnaire has been shipped to and received by the data Coordinating Center. The Warehouse Manager also allows export of QDS questionnaire data to SPSS, SAS, Stata, or MS Access database formats for analysis and reporting.
In short, the general process is to: