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Key Considerations

  • For a section to be a Sequence it must have a clear end.
  • Sequences must contain at least one construct.

Sequences are a type of control construct used to group other constructs together and give it structure. The sequence is a container for Question Components, Conditions, Statements and Loops. They are mostly section headings, but may also be used to designate sub-sections.

The most common use of a sequence is to indicate a section of a questionnaire. For example, an instrument might have Sections A and B with questions within them. Section A and Section B would each become a sequence. A top sequence is always created first which contains all the questionnaire content and is labelled the questionnaire prefix. See Example 1. Sequences consist of a Label field only (see Example 2, Archivist construct build view below), which contains the text of the Sequence.

An additional use of sequences is when a question has several sub-questions and it cannot be entered as a question grid. In this case, the overarching question text becomes a sequence and the sub-questions sit within it. See Example 3. Finally, a sequence must always contain a construct. It usually has a number of constructs; especially question constructs. However, there are rare instances where a sequence only contains statements. See Example 4 below.

Example 1 Questionnaire: ALSPAC Food and Things

Archivist view (alspac_04_fat):

Example 2 Questionnaire: ALSPAC Food and Things

Questionnaire layout:

Archivist construct build view (alspac_04_fat):

Archivist view (alspac_04_fat):

Example 3 Questionnaire: ALSPAC My Teenage Son

Questionnaire layout:

Archivist view (alspac_04_mtsd):

Example 4 Questionnaire: NCDS Parental questionnaire 1974

Questionnaire layout:

Archivist view (ncds_74_pq):


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