21.4 Noninvasive Measurement | 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.

Table 39: 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.