Positive control
Encyclopedia
Positive control may refer to:
- Positive control group in scientific controlScientific controlScientific control allows for comparisons of concepts. It is a part of the scientific method. Scientific control is often used in discussion of natural experiments. For instance, during drug testing, scientists will try to control two groups to keep them as identical and normal as possible, then...
- Positive control, the Air traffic controlAir traffic controlAir traffic control is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other...
practice of controlling aircraft whose positions are determined by direct radar observation