Table 1 Definitions of evaluation criteria

Importance:

Relates to the quality of having significance to the profession; acceptance by competent professionals may be indicative of importance [22, 25].

Precision and clarity:

Relates to being clear and whether the areas discussed in the model are consistent; this further relates to whether the descriptions of the assumptions, concepts and principles are clearly formulated [23–25].

Parsimony and simplicity:

Signify being simple and uncomplicated [25].

Comprehensiveness:

Relates to covering the broad and substantive areas of Interest [25].

Operationality:

Relates to being specific enough to be testable and measurable [25].

Logical structure:

Relates to the degree with which the visual diagram represents and simplifies the understanding of the theory [23].

Validity:

Relates to being valid and offering an accurate representation of the study conducted [25].

Practicality:

Relates to providing a conceptual framework for practice, education and research and being of use to the profession [24, 25].