Template:Growth potential design margin crow extended

Growth Potential Design Margin
The Growth Potential Design Margin ( $$GPDM$$ ) can be considered as a safety margin when setting target MTBF values for the reliability growth plan. It is common for systems to degrade in terms of reliability when a prototype product is going into full manufacturing due to variation in material, processes, etc. Furthermore, the in-house reliability growth testing usually overestimates the actual product reliability, since the field usage conditions may not be perfectly simulated during growth testing. Typical values for the $$GPDM$$  are around 1.2. Higher values yield less risk for the program, but require a more rigorous reliability growth test plan. Lower values imply higher program risk, with less safety margin.

During the planning stage, the growth potential MTBF, $${{M}_{GP}},$$  can be calculated based on the goal MTBF,  $${{M}_{G}},$$  and the growth potential design margin,  $$GPDM$$ :


 * $${{M}_{GP}}=GPDM\cdot {{M}_{G}}$$

or in terms of failure intensity:


 * $${{\lambda }_{GP}}=\frac{GPDM}$$