how do I put policy/practice literature into a synthesis matrix?

Research vs. Policy/practice

For this question, as you can see, you might get hung up on whether to look primarily to research literature, or whether to look to policy or practice literature. If you are primary interested in whether something is true or grounded in a methodological reading of data, then you want research. If you are interested in whether something is right, ethical, or applicable in this context, then you want policy or practice.

Research answers questions posed by, and only answerable in, the "real world"