Noises Affect performance -adversely IPDT cannot control-examples Ambient temperature Power-company voltage Customer-supplied consumables Noises lead to erratic performance IPDT: Integrated product development team C Don Clausing 1998
Noises • Affect performance – adversely • IPDT cannot control – examples: – Ambient temperature – Power-company voltage – Customer-supplied consumables • Noises lead to erratic performance IPDT: Integrated product development team Fig. 11 © Don Clausing 1998
Failure modes Noises lead to failure modes (Fm) One set of noise values leads to fm Opposite set of noise values leads to FM, Simple problem solving chases the problem from FM, to FM, and back again, but does not avoid both fms with the same set of design values-endless cycles of build/test/fix(B/T/F) C Don Clausing 1998
Failure modes • Noises lead to failure modes (FM) • One set of noise values leads to FM1 • Opposite set of noise values leads to FM2 • Simple problem solving chases the problem from FM1 to FM2 and back again, but does not avoid both FMs with the same set of design values – endless cycles of build/test/fix (B/T/F) Fig. 12 © Don Clausing 1998
Performance: favorable conditions Variation during Lab conditions FM No No FM problem problem C Don Clausing 1998
Performance; favorable conditions Variation during Lab conditions No No Fig. 13 FM1 problem problem FM2 © Don Clausing 1998
Simple problem solving Variation during Lab conditions Initial roblem FM No FM problem C Don Clausing 1998
Simple problem solving Variation during Lab conditions Initial problem No Fig. 14 FM1 problem FM2 © Don Clausing 1998
Simple problem solving Variation during Lab conditions FM No FM problem C Don Clausing 1998
Simple problem solving Variation during Lab conditions No Fig. 15 FM1 problem FM2 © Don Clausing 1998