Software installed on a computer network is often inconsistently, or even incorrectly, identified. The same software may be identified in different ways. A catalogue of standardized identifiers is provided. The actual identifiers of software installed on the network are accessed and mapped to the standardized identifiers of the catalogue. The standardized identifiers are used to manage the installed software, monitor license compliance and/or, monitor maintenance agreements amongst other uses. Data relating to the use of the software is also be obtained and associated with the identification data. Identified software is uninstalled if it complies with a preset criterion. The usage data together with the standardized identifiers may be used to un-install un-used or under used software and licenses cancelled or reallocated. The standardized identifiers may be used to identify if forbidden software is being used and if so to compulsorily un-install the software.