Glossary of Terms

	Title	Definition
	Pareto Principle	In 1906, Italian economist Vilfredo Pareto created a mathematical formula to describe the unequal distribution of wealth in his country, observing that twenty percent of the people owned eighty percent of the wealth. In the late 1940s, Dr. Joseph M. Juran inaccurately attributed the 80/20 Rule to Pareto, calling it Pareto's Principle. While it may be misnamed, Pareto's Principle or Pareto's Law as it is sometimes called, can be a very effective tool to help you manage effectively. As a result, Dr. Juran's observation of the "vital few and trivial many", the principle that 20 percent of something always are responsible for 80 percent of the results, became known as Pareto's Principle or the 80/20 Rule.
	Partitioning	Partitioning is a technique for providing isolation between functionally independent software components to contain and/or isolate faults and potentially reduce the effort of the software verification process.
	Path sets	Routes to success.
	PFD	Primary Flight Display.
	Phase	Defined segment of work. Note: a phase does not imply the use of any specific life-cycle model, nor does it imply a period of time in the development of a product.
	Pitot-static system	System of instruments, connecting tubes and air sensors for measuring altitude, airspeed, and rate of climb or descent.
	POEMS	Project Orientated Safety Management System [UK MoD]
	POSMP	Project Orientated Safety Management System [UK MoD]
	Practice	Recommended methods, rules, and designs for voluntary compliance.
	Precipitation	(Meteorological) Rain, hail, sleet or snow in or falling from cloud.
	Preflight (inspection)	"Walk around" inspection of aircraft by pilot, usually immediately prior to flight.
	Premise	A previous statement or proposition from which another is inferred or follows as a conclusion [Oxford English Dictionary 1991]
	Probability	The probability of the event occurring in a given time period or the conditional probability of it occurring given that a previous event has occurred.
	Process	Set of inter-related resources and activities, which transform inputs into outputs
	Product	Any system in the form of an integrated platform, facility, sub-system, equipment, software, or service, which is either to be provided to a customer or taken into service by the Company, as an entity, or being developed for such purposes.

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