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Source: arXiv:2003.00447.
Maintainability is the “degree of effectiveness and efficiency with which a product or system can be modified to improve it, correct it or adapt it to changes in environment, and in requirements”.
Maintenance hotspots, (…) parts of the source code that are most difficult to maintain.
You cannot control what you cannot measure.
— DeMarco, T. (1982). Controlling Software Projects; Management, Measurement and Estimation.