A description of an algorithm that takes polynomial time (that is, for a problem set of size N, the resources required to solve the problem can be expressed as some polynomial involving N).

Problems that are "feasible" are said to be "in P" where P is polynomial time. Problems that are "possible" but not "feasible" are said to be "in NP".

A description of a project or system for which a feasibility study gives a positive answer.