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| Controlled Vocabulary | Desciption | Source |
|---|---|---|
| The subject area the questions and variables map to. | CLOSER | |
| Life Stage | Phases of the participants life used to categorise the instruments (not to be confused with DDI LifecycleEventType). | CLOSER |
| The procedure, technique, or mode of inquiry used to attain the data. | DDI | |
| The person that provided the information for the instrument (not to be confused with DDI Response Unit). | CLOSER | |
| The type of material being used with question External Aids. | CLOSER | |
| The standard internet MIME type used by processing applications for usage with question External Aids. | CLOSER | |
| Variable Source | A description of the type of instrument being used. | CLOSER |
| Biological Sample | ||
| Use Condition | A list of the types of access arrangement for the data. | CLOSER |
| Commonality Type | Type of commonality between items | CLOSER |
| Variable Type Flag | ||
| Analysis Unit (Study) | The unit being analysed | DDI |
| Kind of Data | The kinds of data included in a sweep. | DDICLOSER |