This is not to suggest that there is a rigid distinction between the two — all software architects are going to also be software developers in the process of building an architecture, or when new architecture is not needed, and many software developers will occasionally act as software architects. Nor is this intended to suggest that the architecture of a software project must be planned out in advance with all of the concepts and data and control flow either — just that there are points in the process of developing software where these large-scale architectural decisions about what abstractions to use and the flow between them must be made. But there do seem to be two somewhat distinct "hats" people who program wear.