I need to do a study on (lubrication management and monitoring) in (industrial facilities) and compare it with other techniques to mon

I need to do a study on (lubrication management and condition monitoring) in (industrial facilities) and compare it with other techniques to monitor equipment condition from the following aspect:-
1 What is the fastest way to detect failures in rotating machines?
2 Which is the least expensive?
3 Which one brings great savings to factories?
4 and any other comparisons