Collecting more information, in most cases, may reinforce our judgment but does not help make it more accurate.
This is commonly called "Analysis paralysis." The challenge is to sift through and focus on only the most critical information.
To reinforce his ideas, Gladwell draws from a wide range of examples from science and medicine (including malpractice suits), sales and advertising, gambling, speed dating (and predicting divorce), tennis, military war games, and the movies and popular music.Gladwell also uses many examples of regular people's experiences with "thin-slicing," including our instinctive ability to mind-read, which is how we can get to know a person's emotions just by looking at his or her face.The author describes the main subject of his book as "thin-slicing": our ability to use limited information from a very narrow period of experience to come to a conclusion.This idea suggests that spontaneous decisions are often as good as—or even better than—carefully planned and considered ones.
Gladwell explains how an expert's ability to "thin slice" can be corrupted by their likes and dislikes, prejudices, and stereotypes (even unconscious ones).
Two particular forms of unconscious bias Gladwell discusses are Implicit Association Tests and psychological priming.