Scaling between top line & Bottom line. Here top line for service provider is about adding on sales and revenues by adding customers and work scope, whereas bottom line remains to be customer prerogative with focus on improving income with enhanced profitability. In simple words maintenance is profit centre for service provider, whereas cost center for any Industry. As Client and service provider both being on contrarian side, differences are obvious. Successful partnership is all about collaboration way beyond obvious.Elaborating the concise business model of outsourcing, precisely relevant to maintenance and touching all its components as evident in the current industrial scenario. There is a lot of books available for technology/ process parts and also covering other areas in isolation, but need of single book integrating all aspects of maintenance outsourcing was long felt. The objective here is to provide a holistic view of maintenance outsourcing in all dimensions from both customer and service provider perspective explaining different aspects of business in a nutshell.Outsourcing Maintenance is for: -Management of any Industry looking for outsourcing maintenance or review the existing contract.-Anyone, i.e., people in the maintenance team including shop floor personnel, contract cell, SCM, HR, safety, etc.-All people in the maintenance business, i.e., facility management, asset management, service/maintenance contract, AMC, etc.