Systematic reviews include synthesis which summarizes and organizes the information found in the studies that are identified. This synthesis informs the conclusions that are drawn in the systematic review and focuses on both the methodology and results of the studies. Depending on the project and the types of studies investigated, the synthesis can be simply descriptive or can include more in depth analysis. Generally, synthesis and analysis involve looking for trends and patterns to use in comparisons, to discover explanatory or confounding variables, to develop themes or frameworks, to inform best practices, etc. All systematic reviews include a narrative explanation but other kinds of explanations can also be used.