Personality is deined as the set of characteristics of a person or of people that account for consistent patterns of response to situations. Vocational interest you can pick a better job if you know your personality. Basic research relations with other variables. Interpretability: some inventories measure a single, narrowly focused dimension, others attempt to measure several dimensions that span a broad domain of behaviour, others attempt to measure a small set of very general traits or dimensions. Stability: stability of scoring rules should be getting the same every time you take it, stability across situations. Few measures would be consistent in all situations. Must aware of range of situations in which test will be used. Formulation of a theoretically based deinition of the traits to be assessed = based on murray"s framework for the description of personality (narrow facets) Item selection on the basis of: simplicity of wording, content saturation, inter-scale independence.