This chapter describes some of the most common types, with the understanding that some directors or production houses use different terms to describe similar activities. Some of the important elements to consider include the role of the director during rehearsals and the procedures and terminology that directors use to direct both multi- and single-camera productions. The director concentrates on making sure that camera angles cover the action and that every element of the show is in place. Rehearsals give the director the opportunity to run through the production before it is broadcast or recorded. Directors mark their scripts with a special shorthand system of symbols that helps them to keep track of preplanned camera shots and camera movements, special effects, and graphics. One of the hardest things a director's apprentice encounters early in his or her training is the set of commands that is used to start a program.