Playtesting: the importance of getting to the end:

“And there’s also value in observing that, unless you push through with a playtest, and begin to interrogate the further reaches of your game, you won’t know how early decisions can impact the game later on. This, dear reader, is what people call strategy.”

http://www.brettspiel.co.uk/2013/04/playtesting-importance-of-getting-to-end.html

“There is truth in all feedback. That doesn’t mean you have to change your game… rather, it means that you get to the source of the truth, look at it from the feedbacker’s perspective, and decide what you want to take away from it.”
— Jamey Stegmeier (@jameystegmeier)
“The best playtesters are the ones that ask the right questions. It’s the designer’s job to solve their problems, not the other way round.”
— Brett J. Gilbert (@55cards)