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In software engineering, the laws of software evolution refer to a series of laws that Lehman and Belady formulated starting in 1974 with respect to software evolution. [1] [2] The laws describe a balance between forces driving new developments on one hand, and forces that slow down progress on the other hand.
Prof. Meir M. Lehman, who worked at Imperial College London from 1972 to 2002, and his colleagues have identified a set of behaviours in the evolution of proprietary software. These behaviours (or observations) are known as Lehman's Laws. He refers to E-type systems as ones that are written to perform some real-world activity.
The study of IBM's programming process gave the foundations for Lehman's laws of software evolution. [8] In 1972 he returned to Imperial College where he was Head of Section and later Head of Department (1979–1984). Lehman remained at Imperial for some thirty years until 2002 when he moved to the School of Computing Science at Middlesex ...
Law of Demeter, also known as the principle of least knowledge; Law of conservation of complexity, also known as Tesler's Law; Lehman's laws of software evolution; Loose coupling; Minimalism (computing) Ninety–ninety rule; Open–closed principle; Package principles; Pareto principle; Parkinson's law; Principle of least astonishment (POLA)
In the same vein, Hinley [3] describes two of Lehman's laws of software evolution: The law of continuing change: Systems that are used must change, or else automatically become less useful. The law of increasing complexity: Through changes, the structure of a system becomes ever more complex, and more resources are required to simplify it.
Before joining a16z, Kupor worked in various capacities at Hewlett-Packard, the software company Opsware, and in M&A at Credit Suisse First Boston and Lehman Brothers, according to a16z's website.
Lehman's laws of software evolution; Leibniz's law is a principle in metaphysics also known as the Identity of Indiscernibles. It states: "If two objects have all their properties in common, then they are one and the same object."
The idea of linking software complexity to software maintainability has been explored extensively by Professor Manny Lehman, who developed his Laws of Software Evolution. He and his co-author Les Belady explored numerous software metrics that could be used to measure the state of software, eventually concluding that the only practical solution ...