The traditional model

The software black holes model

Key ingredient

Defects are uniformly distributed

Defects are concentrated in fewer areas

Resource utilization

Spread thinly and evenly

Increased on potential weak areas and decreased otherwise

Development efficiency

Overstaffing of solid development areas and understaffing of weak areas

Staffing is proportionate to expected weakness

Data analysis and QA

Overemphasis on counting bugs and under-emphasis on engineering judgment

Using engineering judgment to assess elimination of black holes

Cost efficiency (quality per $)

Low

High