• Observer effect (information technology)
  Observer effect (information technology)
  In information technology, the observer effect is the potential impact of the act of observing a process output while the process is running. For example: if a process uses a log file to record its progress, the process could slow...
  
  , the impact of observing a process while it is running
• Observer effect (physics)
  Observer effect (physics)
  In physics, the term observer effect refers to changes that the act of observation will make on the phenomenon being observed. This is often the result of instruments that, by necessity, alter the state of what they measure in some manner...
  
  , the impact of observing a physical system
• Observer-expectancy effect
  Observer-expectancy effect
  The observer-expectancy effect is a form of reactivity, in which a researcher's cognitive bias causes them to unconsciously influence the participants of an experiment...
  
   of psychology, how people change their behavior when aware of being watched

• Observer Effect
  Observer effect
  Observer effect may refer to:* Observer effect , the impact of observing a process while it is running* Observer effect , the impact of observing a physical system...
  
  , an episode of Star Trek: Enterprise, named after this effect

• Heisenberg's uncertainty principle
  Uncertainty principle
  In quantum mechanics, the Heisenberg uncertainty principle states a fundamental limit on the accuracy with which certain pairs of physical properties of a particle, such as position and momentum, can be simultaneously known...
  
  
• Actor-observer bias
  Actor-observer bias
  The actor-observer asymmetry touches on the fundamental questions of how people gain access to their own and other people's minds and whether those modes of access are distinct....
  
  

See also

• Schrödinger's cat
  Schrödinger's cat
  Schrödinger's cat is a thought experiment, usually described as a paradox, devised by Austrian physicist Erwin Schrödinger in 1935. It illustrates what he saw as the problem of the Copenhagen interpretation of quantum mechanics applied to everyday objects. The scenario presents a cat that might be...
  
  , a thought experiment, often described as a paradox, devised by Austrian physicist Erwin Schrödinger
• Hawthorne effect
  Hawthorne effect
  The Hawthorne effect is a form of reactivity whereby subjects improve or modify an aspect of their behavior being experimentally measured simply in response to the fact that they know they are being studied, not in response to any particular experimental manipulation.The term was coined in 1950 by...