Dry runs, also known as TRIALS, tests, and rehearsals, are activities that are done in preparation for a larger event. They involve running through the steps of the event to make sure everything is in order before it actually takes place. TRIALS are short-term activities that are used to evaluate the effectiveness of a plan or process. Tests are similar to TRIALS, but they are more focused on the technical aspects of the event. Rehearsals are longer-term activities that involve practicing the event multiple times to ensure that everyone involved is prepared.