A description of the type of instrument being used.

ID	Term	Description
1	Questionnaire	e.g. CAPI, CATI, mailed self-completion, etc.
2	Clinical protocol	e.g., spirometer, blood pressure monitor
3	Cognitive test	e.g., recall, memory, recognition
4	Educational test	e.g., British Ability Scales
5	Physical test	e.g., timed walk
6	Diary	e.g., food diary, expenditure diary
7	Event history calendar	See http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2798968/
8	Qualitative protocol	e.g., interview transcripts
9	Linked data	e.g., administrative records, Census, enviroment data, external data (i.e., not collected as part of the study), usually linked via respondent's geography or NINO. Do not confuse with linked data (RDF).
10	Spatial data	e.g., marker of location, may include altitude
11	Device/app	e.g., GPS positioning, pedometer

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