If we don't know much about the business flows of a design problem, are we supposed to figure it out by ourselves or ask the interviewer to provide? For example, if you're not a user of netflix or youtube, it'll be difficult to figure out the necessary components. Often I feel my time is being wasted to guess the possible flows. Can we ask the interviewer to provide these and we focus on how to design the system to support it? In particular, can we ask something like this: I'm not familiar with the use of this system, could you please help me understand the major business flows in the system?