Multi-view environments for software development allow different views of a software system to be defined to cover the requirements of different stakeholders. One way of ensuring consistency of overlapping information often contained in such views is to project them “on demand” from a Single Underlying Model (SUM). However, there are several ways to construct and adapt such SUMs. This paper presents four archetypal approaches and analyses their advantages and disadvantages based on several new criteria. In addition, guidelines are presented for selecting a suitable SUM construction approach for a specific project.