Observation in the natural sciences is an act or instance of noticing or perceiving and the acquisition of information from a primary source. In living...

An observation post (commonly abbreviated OP), temporary or fixed, is a position from which soldiers can watch enemy movements, to warn of approaching...

biodiversity observations. Observation.org may be accessed via its website or from its mobile applications like ObsIdentify. The Observation.org database holds...

An observation tower is a structure used to view events from a long distance and to create a full 360 degree range of vision to conduct long distance...

Naturalistic observation, sometimes referred to as fieldwork, is a research methodology in numerous fields of science including ethology, anthropology...

An army of observation is a military body whose purpose is to monitor a given area or enemy body in preparation for possible hostilities. Some of the...

An observation deck, observation platform, or viewing platform is an elevated sightseeing platform usually situated upon a tall architectural structure...

statistics, a unit of observation is the unit described by the data that one analyzes. A study may treat groups as a unit of observation with a country as...

Participant observation is one type of data collection method by practitioner-scholars typically used in qualitative research and ethnography. This type...

Medical observation is a medical service aimed at continued care of selected patients, usually for a period of 6 to 24 (sometimes more) hours, to determine...