Mixed interactive systems (MIS) denote an advanced form of interaction that aims at combining physical and digital worlds, such as mixed and augmented reality, tangible user interfaces, ubiquitous computing, etc. Their main interest relates to the use of physical artifacts from the user's activity customary context. These can support partly the user communication with the interactive system: personal belongings and everyday physical objects are very familiar to users for smoothly interacting with the system. Initially limited to very specific domains, MIS now appear in many domains, thus motivating the need for adapted design supports. Beyond the technological issues and challenges, the variety of entities involved and the originality of the conditions of use, innovative interaction forms also trigger the need to focus on the elaboration of a solid, structured and common usability knowledge dedicated to MIS. In this chapter, we first report on a systematic review of the literature on MIS evaluation. From that review, usability recommendations were selected and deciphered before reformulating them under a common format. Finally, three different classification schemes of the usability recommendations obtained are proposed to facilitate search and retrieval, but also to better integrate them into the MIS development process.