ROI of Software Process Improvement: Metrics for Project Managers and Software Engineers
19.2 Analysis of Benefits
The benefits of using the Software Inspection Process to help produce 10,000 lines of code are $2,767,464. This is obtained by subtracting $1,742,533 in new total life cycle costs from $4,509,997 in old total life cycle costs.
The benefits of using the Personal Software Process SM to help produce 10,000 lines of code are $4,469,997. This is obtained by subtracting $40,000 in new total life cycle costs from $4,509,997 in old total life cycle costs.
The benefits of using the Team Software Process SM to help produce 10,000 lines of code are $4,341,496. This is obtained by subtracting $168,501 in new total life cycle costs from $4,509,997 in old total life cycle costs.
The benefits of using the Software Capability Maturity Model to help produce 10,000 lines of code are $3,023,064. This is obtained by subtracting $1,486,933 in new total life cycle costs from $4,509,997 in old total life cycle costs.
The benefits of using ISO 9001 to help produce 10,000 lines of code are $569,841. This is obtained by subtracting $3,940,156 in new total life cycle costs from $4,509,997 in old total life cycle costs.
The benefits of using Capability Maturity Model Integration to help produce 10,000 lines of code are $3,023,064. This is obtained by subtracting $1,486,933 in new total life cycle costs from $4,509,997 in old total life cycle costs. Table 39 illustrates the analysis of benefits.
| SPI Method | Benefit | Benefit/Person | Normalized |
|---|---|---|---|
| Inspection | $2,767,464 | $691,866 | 0.62 |
| Personal Software Process SM | $4,469,997 | $1,117,499 | 1.00 |
| Team Software Process SM | $4,341,496 | $1,085,374 | 0.97 |
| Software Capability Maturity Model | $3,023,064 | $755,766 | 0.68 |
| ISO 9001 | $569,841 | $142,460 | 0.13 |
| Capability Maturity Model Integration | $3,023,064 | $755,766 | 0.68 |
The most beneficial SPI method is the Personal Software Process SM at $4,469,997. The least beneficial SPI method is ISO 9001 at $569,841. Benefit per person ranges from $142,460 for ISO 9001 to $1,117,499 for the Personal Software Process SM .
On a normalized scale, the Personal Software Process SM and Team Software Process SM have the highest benefits. ISO 9001 has the lowest benefits on a normalized scale.