Seth Godin's The Dip: A Little Book That Teaches You When to Quit (and When to Stick) [1] is an oft-recommended resource on the topic, though I didn't find it p

Seth Godin's The Dip: A Little Book That Teaches You When to Quit (and When to Stick) [1] is an oft-recommended resource on the topic, though I didn't find it particularly helpful the last time I was in a similar situation. [1] http://www.amazon.com/dp/1591841666 http://www.amazon.com/dp/1591841666