Testing IT-systems by use of simulation requires a thorough planning and preparation in order to create a realistic clinical environment. For a successful test through simulation a dedicated test team to control the environment is needed, as well as people to play the role of patients and staff. Relevant artifacts and elaborate scenarios ensure the narrative. This paper explores the preliminary work and execution of an extensive test of a Computerized Order Entry System prototype. Central to the setup of the test is a script which outlines the method by guiding the preparation and execution.