Empirical insights
A synthesis of what is already known (and maybe what is not)
Methodologies
An analysis of methods used, and their advantages and disadvantages
Theories
An investigation of different theories used, and their importance. This might cover the implications for the results
Gaps in literature and a research agenda
This can relate to reviews with an empirical, methodological, and theoretical focus — to explore omissions and limitations in approaches and suggest ways forward
Relevance for real world applications
A discussion or synthesis of how useful the literature is for real-world applications (policy, planning, etc.)—perhaps with the use of case studies
Conceptual model
Provides explicit structure on how dependent and independent variables are related. Can be