Hi Fred and All, The formula could work as a piano replacement formula after the actual workload number is calculated, Could work sort of like this, Assume instruments last 30 years for a base number, (30 - Age) x Condition x Quality x Climate x Usage x Acceptable Standards x actual workload = remaining life expectancy. The "actual workload" multiplier for an institution where 1.25 technicians are needed, but only one will exist, would be 0.8 since they have 1/5 less that what the formula recommends. -Mike
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