"Yes" or "No," from the #1 New York Times bestselling author Spencer Johnson, presents a brilliant and practical system anyone can use to make better decisions, soon and often -- both at work and in personal life.
The "Yes" or "No" System lets us:

focus on real needs, versus mere wants
create better options
see the likely consequences of choices
and identify and then use our own integrity, intuition, and insight to gain peace of mind, self-confidence, and freedom from fear

(From Goodreads)