Jumping to conclusions

Jumping to conclusions (officially the jumping conclusion bias, often abbreviated as JTC, and also referred to as the inference-observation confusion) is a psychological term referring to a communication obstacle where one "judge[s] or decide[s] something without having all the facts; to reach unwarranted conclusions". In other words, it is when a person fails to distinguish between what they have observed first hand, and what they have only inferred or assumed. Because it involves making decisions without having enough information to be sure that one is right, this can give rise to poor or rash decisions.