观察是一种生物（例如：人类）的感知或智能累积的活动，以不同的感官（如眼睛）凡感觉特定的现象从而归纳出知识到某个先前的知识与观念架构内以作出判断。

量子力学的观察指的是测量

Naturalistic observation is, in contrast to analog observation, a research tool in which a subject is observed in its natural habitat without any manipulation by the observer. During naturalistic observation, researchers take great care to avoid interfering with the behavior they are observing by using unobtrusive methods. Naturalistic observation involves two main differences that set it apart from other forms of data gathering. In the context of a naturalistic observation the environment is in no way being manipulated by the observer nor was it created by the observer.