26th November, 2014
A study was conducted by the SEI (now CMMI Institute) on the metrics data collected from 35 large organizations across the world. These organizations having low as well as high maturity apply CMMI Process Improvement practices to their Software Engineering, System Engineering and other Engineering activities.
In this study Industrial Systems Group (ISG) of Hitachi observed the effect of the peer review and quality assurance on the Defect Densities. Results are based on the pilot and statistical analysis.
Regression Analysis and Statistical Process Control were used for Quantitative Project Management. Initially ISG observed that there was a strong negative correlation (r2=.72) between defect detection prior to unit testing and total defect density throughout the product life cycle.
Based on the study it was observed that:
As seen here, Peer Review With and Without Tool Aid, there was an increase in the upper limit of manageable review size by 30 percent and ROI (Return on Investment) for Fagan Inspection was 3.9:1 and for less formal walkthroughs ROI was 2.3:1. Data from 16 pilot projects was collected and out of these defects density of 15 pilot projects was found to be lower than defect density baselines established by ISG. The ROI of 1.7:1 was also observed due to the decrease in the cost of testing and reviews. QA Department also observed a ROI ratio in the range of 6.3:1 to 9.8:1 attributed to the costs of correcting field errors and other management and engineering problems, factored into the ROI ratios.
This shows that CMMI Process Implementation can lead to improved reviews, less number of defects and reduced cost of fixing defects with the implementation of process improvements.
Source: Performance Results of CMMI®-Based Process Improvement Report.
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