In this lesson, among other things, we learned:

• Compare the benefits and limitations of narrowly defined eligibility criteria to broadly defined eligibility criteria
• Recognize the impact of the 'healthy worker effect'.
• Write inclusion and exclusion criteria that are less subject to misinterpretation.
• Consider the advantages and disadvantages of a run-in period or extended baseline for a study.
• Use a simple method to monitor patient accrual.
• Recognize barriers to patient participation in clinical trials
• Distinguish between an efficacy study and an effectiveness trial.