Table 3 Variables that we propose to extract, by over-arching category

Characteristics of the study authors

Surnames

Countries (that authors’ primary institutional affiliations are located in)

Lens/disciplinary points of view

Characteristics of the publication

Study name

Publication year

Journal

Published (yes/no)

Characteristics of the model/framework

Name

Purpose/aim

Population developed in/for

Targeted stage of research process

Elements (description)^a

Proposed relations between elements^a

Location on spectrum of engagement [22]

Strengths and weaknesses (stated in study)