By doing all the previous actions in creating an evaluation plan (mission, objectives & deliverables, questions the evaluation will answer, assumptions, boundaries, and stakeholders), you can now develop the strategies you will use to perform the evaluation.  An evaluation strategy describes how the ends (goals) will be achieved by the means (resources).  This details the actions you will perform during the evaluation.

Items I usually include in a training evaluation strategy are the methods to, collect data, analyze it, and report the findings.  Here is an example of recent evaluation plan strategy I did for a Level 3 evaluation:

Validate the strategies with your evaluation stakeholders and client, make changes as needed, and move to the next step.