274 Copyright © 2019, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 12 DOI: 10.4018/978-1-5225-7271-8.ch012 ABSTRACT Complex systems usually have to deal with a huge number of potential situations and contingencies. Therefore, a mechanism is required that enables the expression of variability at design-time so that it can be efciently resolved at run-time. As composability plays an increasingly relevant role in build- ing systems in an economic way, variability management should also contribute to and be taken into account in terms of composability. This chapter presents a variability management workfow aimed at supporting diferent developer roles in an ecosystem context. Two kinds of variability are addressed: in system operation and associated with quality of service. The former provides robustness to contingen- cies, while the latter focuses on the quality of the application (in terms of non-functional properties) under changing situations and limited resources. The concepts introduced in this chapter conform to the structures and principles of the H2020 European Project RobMoSys, which consolidates composability in the robotics domain. Managing Variability as a Means to Promote Composability: A Robotics Perspective Matthias Lutz Ulm University of Applied Sciences, Germany Juan F. Inglés-Romero Biometric Vox, S.L., Spain Dennis Stampfer Ulm University of Applied Sciences, Germany Alex Lotz Ulm University of Applied Sciences, Germany Cristina Vicente-Chicote Universidad de Extremadura, Spain Christian Schlegel Ulm University of Applied Sciences, Germany