Difference between Open-and-shut and Obvious

Open-and-shut

Part of speech: adjective

Definition: simple and obvious; easily decided

Obvious

Part of speech: adjective

Definition: Easily discovered, seen, or understood; self-explanatory.

Example sentence: What information consumes is rather obvious: it consumes the attention of its recipients. Hence a wealth of information creates a poverty of attention, and a need to allocate that attention efficiently among the overabundance of information sources that might consume it.