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 they are 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 may also be obtained and associated with the identification data. The usage data together with the standardized identifiers allows managers to more reliably manage software on the network. For example un-used software may be un-installed and licenses cancelled or reallocated.