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Code Maintainability Rating aims at defining project rating related to the value of Technical Debt Ratio.
How metric helps
Code Maintainability Rating helps to identify the ratio of "Technical-Debt vs. Cost-to-Rewrite". In case the ratio grows significantly, a decision may be made whether it's a good time to rewrite the application instead of spending too much invaluable time reimbursing your debt may be taken.
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How metric works
Chart overview
Chart shows code maintainability grade for each project child unit - Axis Y on a day by day timeline - Axis X.
Every project child unit is clickable in the legend so that its grade can be shown/hidden on the chart.
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Calculation
Maintainability Rating = Technical Debt / Development Cost,
where
• technical debt of the project (= sum of the debt of all issues)
• divided to an estimation of the cost to rewrite the application from scratch
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• <=5% of the time that has already gone into the application, the rating is A (best)
• between 6 to 10% the rating is a B
• between 11 to 20% the rating is a C
• between 21 to 50% the rating is a D
• anything over 50% is an E (worst)
RAG thresholds: Red = is for E, D; Amber = is for C; Green = is for B, A.
Data Source
Data for the metric can be collected from Sonar or any other project tracking/engineering tool..
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