There are number of different Maintenance Measures. Few of them are Breakdown Report, Callback, and Maintenance Benchmarks. Breakdown Report is available in various forms such as list of breakdowns with their causes and response times to MTBF and MTTR. A callback is thought to be a person returning to work on the same unit/system or related system as their original work. Maintenance costs give an idea of the total maintenance costs of the past few years. Maintenance work tells us how many people are needed to maintain a building, how many hours do they have to work and how much should be their wages. Maintenance of the parts will help you reduce your inventory.