“Run-in period is a period before a clinical trial is commenced when no treatment is given. The clinical data from this stage of a trial are only occasionally of value but can serve a valuable role in screening out ineligible or non-compliant participants, in ensuring that participants are in a stable condition, and in providing baseline observations. A run-in period is sometimes called a washout period if treatments that participants were using before entering the clinical trial are discontinued.”

This is consistent with the #3 selection being Randomization, which is also part of a testing cycle of a drug.

http://en.wikipedia.org/wiki/Run-in_period