1. Recording data

2. Translating research questions into data
Problem
Concepts
Research question(s)
Variables:
Dependent
Independent
Mediating: inbetween, explains the relationship
Moderator: affects the reationship
Control: need to be constant
Confounding: difficul to measure, need to be considered
Planned analysing method: level of measurement
Items in the questionnaire: understandable, fool-proof, cost-efficient
Recorded data: from the questionnaire, from other data source (eg. notes, registers, background knowledge etc.), computed variables