Aims to determine any errors in the questionnaires or areas that need improvement such as ordering of questions, wording, and the natural flow from one section to another
If alpha is high (at least 0.80, closer to 1.00), then this suggests that all of the items are reliable and the entire questionnaire is internally consistent
Represent ranges or class intervals, frequently used for numerical responses like income and age in which the respondent may not be able to provide an exact answer
Represent grouping of responses which vary in degree or intensity along a continuum, commonly used for coding responses to attitudinal questions (Likert scaling)
Multi-digit codes divided into two sets: (1) leading digits represent a major classification, and (2) trailing digits represent a specific category within the major classification. This coding scheme can be extended to more than 2 levels.