C. Stephanidis and M. Antona (Eds.): UAHCI/HCII 2014, Part IV, LNCS 8516, pp. 431–442, 2014. © Springer International Publishing Switzerland 2014 Requirements for the Successful Market Adoption of Adaptive User Interfaces for Accessibility Matthias Peissner 1 , Andreas Schuller 1 , Daniel Ziegler 1 , Christian Knecht 2 , and Gottfried Zimmermann 3 1 Fraunhofer-Institute for Industrial Engineering, Stuttgart, Germany {matthias.peissner,andreas.schuller, daniel.ziegler}@iao.fraunhofer.de 2 University of Stuttgart, Stuttgart, Germany christian.knecht@iat.uni-stuttgart.de 3 Media University Stuttgart, Stuttgart, Germany gzimmermann@hdm-stuttgart.de Abstract. The concept of adaptive user interfaces is a promising solution for providing users with a wide range of individual needs with accessible technol- ogy. Developers only have to implement one generic solution to offer a multitude of individually optimised concrete user interfaces. Whereas a lot of technical functionalities and characteristics of adaptive user interfaces are al- ready solved, there is still no widespread market adoption of adaptive UI tech- nologies. This paper presents a collection of requirements for adaptive user interface systems that can enable widespread market adoption. Furthermore it identifies strategies and individual answers, how these requirements can be ad- dressed and met in future systems building on the Prosperity4all approach. It gives a comparison of existing research solutions and how they compare with the stated requirements. Keywords: Adaptive user interface, adaptive systems, accessibility, user char- acteristics, market adoption, requirements. 1 Introduction In order to provide accessible technology to end-users, adaptive user interfaces are recognized as one established solution (e.g. [1], [2] and [3]). By recognizing the per- sonal and contextual user needs, the system can dynamically react by providing per- sonalized user interfaces that can overcome usage barriers. Although there is a long term history in the research field of adaptive user interfaces there are no significant approaches established on the mainstream market yet. Our proposition is that there are several essential requirements that adaptive user interface systems must comply before being able to reach significant impact on the software market: Being able to provide wide ranging user interface adaptations may require a huge knowledge base and complex adaptation algorithms. This can hardly be accomplished in a centralized system. Therefore, we have identified the following prerequisite