Productive maintenance
Maintenance that leads to a benefit by meeting a new requirement, not just a continuation of the previous state.
Unproductive maintenance
Making changes to the program not because of any new requirements for that program but in order to continue using a shared data file that has been changed for some other
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productivity is how much you get done, efficiency is what you complete/how much effort you put in. so if you can do something easily and in a timely manner then it was efficient, if you got a lot done you were productive. you can be both.
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What is difference between hvac and ahu
no difference