The method used to collect the data; instrumentation characteristics. As of version 2.6 this element is a conceptualText type and supports the use of a controlled vocabulary. To specify the use of a Controlled Vocabulary or standard concept use the internal element "concept". DDI provides a Controlled Vocabulary for this location: "ModeOfCollection". If multiple concepts are needed the parent element should be replicated. Internal text related to each concept should be allocated to accompany the relevant concept.XHTML formatting may be used in the txt element for forward-compatibility with DDI Lifecycle.
<collMode>telephone interviews</collMode>
<collMode><concept vocab="ModeOfCollection" vocabURI="http://rdf-vocabulary.ddialliance.org/cv/ModeOfCollection:3.0" vocabInstanceCodeTerm="Interview.FaceToFace">Face-to-Face Interview</concept></collMode>
<collMode>mail questionnaires</collMode>
<collMode>computer-aided telephone interviews (CATI)</collMode>