A good data definition provides ALL the characteristics forms (questionnaires, CRFs) and associated variables. What is needed is good old "TLV".
| Stands For.. | Overview | |
|---|---|---|
T | Type of Variable | The most common types are dates, number, coded variables (e.g., 0 = No, 1 = Yes;). |
L | Layout and Logic | Indicate the look and feel of the variable, and when it should be displayed (e.g., only show if subject is a male). |
V | Validation | Indicate the rules that govern the acceptable variable values (acceptable range, units) |
What To Do
Use A Spreadsheet
Document your data definition using the spreadsheet here.
Mark It UP
When sending us a form, mark it up with the data definition.
Example Marked Up Form
Keep It Simple
Forms should use the cleanest, simplest layout possible. Standard practice is to use one-row-per-variable (examples here).
Leverage Visual Validation
A form's spatial and visual layout can be it's most important validation (see examples here).