Massive Open Online Courses (MOOCs) hold the potential of providing education at large scale. However, the challenge lies in the scalability of their educational design. It is unclear whether and to what extent MOOCs to provide active and complex learning activities, support and feedback to large numbers of students without increasing teacher (time) costs. This study identifies scalable best practices of MOOC design elements regarding: constructive alignment, interaction, task complexity and formative assessment and feedback. At the moment of writing, five semi-randomly selected MOOCs of different scientific domains were qualitatively analysed by means of our design survey instrument. Preliminary results indicate that most MOOCs lack constr...