More and more higher educational institutions invest in technology-enhanced learning spaces, which raises the question of how these environments can be shaped to be as effective as possible. A specific new learning space is the synchronous hybrid or blended learning environment in which both face-to-face and remote students can simultaneously attend learning activities. Given synchronous blended learning is relatively new, there a few studies that have investigated its use and effectiveness. This study aims to synthesize the best available evidence worldwide to 1) have an overview of the state-of-the-art of the current research, to get a better insight in the do's and don'ts within this setting by summarizing 2) benefits, 3) challenges; and 4) to formulate design principles. Finally, 5) we also aimed to define the future directions for investigation based on the current research gaps. In line with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), this study included 47 studies which were analyzed to respond to our five research questions. One of the main findings is that existing research express cautious optimism about synchronous hybrid or blended learning which creates a more flexible, engaging learning environment compared to fully online or fully on-site instruction. Yet, this new learning environment has several challenges which are both pedagogical and technological in nature. To meet these challenges several design guidelines are formulated. A final conclusion is that most of the existing literature is still exploratory and qualitative in nature and has focused mostly on the description of students' experiences, the organizational implementation and the technological design. Empirical studies have only begun to emerge and more research is needed examining different pedagogical scenarios and its impact on student outcomes.
KeywordsSynchronous hybrid or blended learning; Here or There Instruction ; Systematic review; Research gaps Recently, at the university [institution and location omitted for blind review], two models of synchronous hybrid learning environments have been designed as displayed in Figure 1.