Introduction

Judgments about people often begin with limited information: a brief conversation, a missed deadline, a confident presentation, or a group label. We then try to infer qualities that are less directly visible, such as competence, reliability, or intention.
These judgments matter, but they are vulnerable to several influences. One striking trait can shape an overall impression. A person's actions can be separated from the circumstances that produced them. Agreement within a group can feel like stronger evidence than it is.
This lesson examines those patterns while preserving an important distinction: careful judgment does not require ignoring behavior. It requires connecting a conclusion with relevant evidence and considering reasonable alternatives.