Scoping can be defined as the process of deciding in which parts of an organization's products, features and domains systematic reuse is economically useful. It generally is the first phase in product line engineering. For a decade now scoping has been recognized as a discipline of it's own in product line engineering. So it's time to look at what has been done in scoping in the last years and what is still to be done. In this survey, we identify and characterize existing scoping approaches with the main goal to derive open areas and research questions for further research in scoping. We analyze and compare existing approaches and derive open and partially addressed research questions that can be tackled by researchers in product line engineering in the next years.
