Start by defining quality.
Software metric: https://en.wikipedia.org/wiki/Software_metric
''' Common software measurements include:
- Balanced scorecard - Bugs per line of code - Code coverage - Cohesion - Comment density[1] - Connascent software components - Constructive Cost Model - Coupling - Cyclomatic complexity (McCabe's complexity) - DSQI (design structure quality index) - Function Points and Automated Function Points, an Object Management Group standard[2] - Halstead Complexity - Instruction path length - Maintainability index - Number of classes and interfaces[citation needed] - Number of lines of code - Number of lines of customer requirements[citation needed] - Program execution time - Program load time - Program size (binary) - Weighted Micro Function Points - CISQ automated quality characteristics measures '''
Category:Software metrics https://en.wikipedia.org/wiki/Category:Software_metrics