Logic and Observation both are important

Most of the time decision can be of two types "Logic Lead" and "Observation Lead". Logic lead decision making is internal and based on the facts/information someone already know. Where as sometimes we don't need to think so much to conclude a decision rather need to observe the context and even the question carefully to get the answer.

In logic lead decision making the biggest mistake someone can do is ignoring to consider the targeted audience, after all audience is who evaluates the quality of your decision. But decision maker is solely responsible for the longterm effect of the decision be it good or bad.