The CLOSER project uses a number of controlled vocabularies which are either DDI standard or CLOSER created. They are agreed sets of descriptions for parts of the project. Please refer to each individual page for more details.

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

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