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Life cycle methodology. The use of any one of several structured methods to plan, design, implement, test. and operate a system from its conception to the termination of its us. See: waterfall model.

Line Charts Charts used to track the performance without relationship to process capability or control limits.

Logic analysis. (IEEE) Evaluates the safety-critical equations, algorithms, and control logic of the software design. (2) Evaluates the sequence of operations represented by the coded program and detects programming errors that might create hazards.

Lower Control Limit A horizontal dotted line plotted on a control chart which represents the lower process limit capabilities of a process.