Usability Barriers in Smart TV User Interfaces: A Review and Recommendations Smart TV is a television set that has the capabilities of processing, storage, and connectivity. Besides these features, smart TV brings appbased entertainment, which is beyond the scope of legacy TV systems. Being a connected device, smart TV is facing numerous challenges not only in the form of security and privacy but also usability and accessibility. For example, a smart TV has access to diverse data sources. Therefore, searching for desired content on a smart TV is difficult and timeconsuming. Although, Electronic Program Guides (EPGs) provide some facilities for searching desired contents; yet, scrolling a long list of programs is not welcomed by the viewers. In this paper, we are reviewing the inter and intraapp navigational complexities and their effects on usability, learnability, and cognition. Although, smart TV manufacturers are trying to produce smart TVs with simple to use interfaces; yet, the existing smart TVs interfaces have accessibility and usability issues that are discussed in this paper. This paper further presents some recommendations and guidelines for the design of a universal user interface for smart TV.

Stage UI: Live TV Application Tailored for Mobile Devices Change in cultural trends of multimedia deployment has put a new weight to rolls and uses of mobile devices. The size of the screen and touch possibilities provide additional dimensions in designs of the user interfaces compared to the TV exclusive applications. In this paper we have explored new possibilities to extend the STAGE TV application in two directions: menus layout and deployed devices. This approach we named Stage UI  an interface for hybrid TV receivers based on the Android operating system for TV. This interface has modern TV functionalities that allow users to interact with Google services, and to promote and prioritize content. This solution is available for both, overthetop devices, and for hybrid solutions via Android TV Input Frameworks. Stage UI is completely modular and customizable to the operator as the end user. Due to its interface scalability, it is also adaptable to mobile devices. In this paper we present one solution how to adapt the Live TV application for mobile devices.