Use Cases – The IEC 62559 Methodology

Abstract

This chapter deals with the approach of use cases, their properties and a guideline for creating them. The Use Case Methodology and several different types of use cases are introduced. A standardised Use Case Template is presented and its usage is explained with help of an extensive example from the domain of Active Assisted Living. Additionally, the IHE process from the healthcare sector is presented as well as its common features and differences to the Use Case Methodology. Therefore, the standardised Use Case Template is extended through some aspects from the IHE process which provide a more detailed view on the actors' interfaces. 2.1 The Development Process Use cases are first building blocks for projects in software engineering and describe the developed system and its functionalities in static as well as dynamic aspects. The static view is given through the presentation of actors that are related to the system, the dynamic view is described through the relation between actors and the system by use cases. A definition of use case is given in ISO/IEC 19505-2:2012 as follows. A use case is the specification of a set of actions performed by a system, which yields an observable result that is, typically, of value for one or more actors or other stakeholders of the system. – ISO/IEC 19505-2:2012 [10]