Creating a matrix

The matrix is a graph that allows you to have a visual image of both your themes or key issues, along with the
different sources that address each of those themes. It serves as an organizational template.
Craft a matrix of your own: top line denotes sources, descending blocks on the left reflect sub-topics or issues.
The idea here is to give yourself a clear and simple model that demonstrates which of your sources address
the same theme or themes. The matrix is an organizational tool.
Minimum nine sources.
Example matrix- Bee Colony Collapse Topic