1. Uncovered failures in MSSG G
Subsystem affected by uncovered failure

2. Optimal redundancy No uncovered failures Uncovered failures Pr Pr Pr G

3. Imperfect fault coverage
Redundant parallel system
Detected or undetected failure
Task sharing parallel system
Detected failure
Undetected failure

4. UGF for uncovered failures X – performance at failure statew
X – performance at failure state
 (Gi, x) =  (x, Gj) = x

5. Optimal solution for C*=50
Optimization problem
No sharing
R(C*)=Pr(G>D) max
No redundancy
Optimal solution for C*=50