How Could You Ever Test a Product If You Didn’t Know What You Don’t Know

I'm reiterating my point of getting the product into the hands of the customer or the testing team as fast as you possibly can. A developer cannot be a standalone entity, operating in isolation. All individuals need feedback and we cannot deliver quality unless we have an on-looker or customer. We need an audience or we are really just performing for ourselves, without feedback. We need a mirror at a minimum! Give your code to the customer and then determine what the portfolio of needs and changes looks like. Be agile.