2. From conceptual modeling to requirements engineering

2.1 IS conceptualization and development cycle

The aim of all engineering activities, whatever their nature, is to produce a product. Civil engineering, for example, aims to build bridges, while automotive engineering builds cars, and so on. IS engineering, on the other hand, aims to build the products that are information systems. IS products, like bridges and cars, can be described at different levels of detail and abstraction. IS engineering recognizes two main levels: the conceptual product and the realized product. It is universally accepted that the set of engineering activities leading to the IS product can be divided into two groups (figure 1 ):

...