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MMP.17:3 - Forces
| Force | Tension |
|---|
| Selected response | Reproducing less can save work, while a later question may need something discarded. |
| Construction cost | More source evaluations can improve the replacement, but may consume the saving it was meant to provide. |
| Known structure | Conservation, bounds and symmetries restrict useful candidates; a convenient restriction can also exclude the needed response. |
| Local and broad use | Concentrating cases near a decision can improve that answer while leaving other inputs poorly represented. |
| Several error sources | Source computation, surrogate approximation and uncertain source premises can each limit use and require different repairs. |
| Continued use | Reuse makes construction worthwhile, but changed inputs or questions can invalidate the substitution. |