When is good enough - good enough

from The "age of good enough"

One of the ongoing problems with research as well as consumption is determining when is spending or analysis good enough. We always want more but is there a point of diminishing returns. The answer is yes, there is always diminishing returns, but at what point do you stop? It is easy to say that you can do a cost/benefit analysis, but for a good or a service, can you actually measure the benefit? If I can get an extra 10 bps of return out of new model feature as measured in a back-test, is that enough? Is it worth the added work? Is it work forming another condition? 

The question of good enough and how to measure the benefit is worth serious consideration.