This question is likely too subjective for Stack Overflow. You can repost it to softwareengineering.stackexchange.com. — mic 23 secs ago

Cross-site dupe: softwareengineering.stackexchange.com/questions/372462/… — Sweeper 28 secs ago

Not a programming question, but a question lots of programmers might care about (proof: upvotes) — Jivan 29 secs ago

This might be better suited for other SO sites e.g. code review or software engineering. If you are going to change model mid-flight, then you probably have to pass the model as a parameter to your move() method — David Brossard 44 secs ago