Skip to content

R0007/2026-03-20/C005 — Assessment

BLUF

Schulmeyer did formalize the NNPP concept and estimated up to three out of ten may qualify. However, the concept appeared in the 1987 Handbook of Software Quality Assurance, not 1992. The 1992 reference is to Total Quality Management for Software, a later edition.

Probability

Rating: Likely (55-80%)

Confidence in assessment: Medium

Confidence rationale: Based on web-accessible evidence from primary and secondary sources.

Reasoning Chain

  1. Schulmeyer states: In a team of ten, expect as many as three people to have a defect rate high enough to make them NNPPs. The probability that there is not even one NNPP out of ten is virtually nil. The concept appeared in the Handbook of Software Quality Assurance (1987) and Total Quality Management for Software (1992). [SRC01-E01, High reliability, High relevance]

Evidence Base Summary

Source Description Reliability Relevance Key Finding
SRC01 Net Negative Producing Programmer High High Schulmeyer did formalize the NNPP concept and estimated up to three out of ten may qualify. However, the concept appeared in the 1987 Handbook of Software Quality Assurance, not 1992. The 1992 reference is to Total Quality Management for Software, a later edition.

Collection Synthesis

Dimension Assessment
Evidence quality Medium to Robust
Source agreement High
Source independence Assessed per claim
Outliers None identified

Detail

Schulmeyer states: In a team of ten, expect as many as three people to have a defect rate high enough to make them NNPPs. The probability that there is not even one NNPP out of ten is virtually nil. The concept appeared in the Handbook of Software Quality Assurance (1987) and Total Quality Management for Software (1992).

Gaps

Missing Evidence Impact on Assessment
Full-text access to primary sources Low to Moderate

Researcher Bias Check

Declared biases: No researcher profile provided.

Influence assessment: Standard claim verification — no specific bias concerns identified.

Cross-References

Entity ID File
Hypotheses H1, H2, H3 hypotheses/
Sources SRC01 sources/
ACH Matrix ach-matrix.md
Self-Audit self-audit.md