1. Method for monitoring at least one message, each message being associated with an action generated by at least one element or the user of an information system ( 1000 ) hereinafter referred to as an IS, said message or messages being collected by at least one message collecting device of the IS, characterised in that it includes the following steps: defining a plurality of reference event categories each associated with at least one reference action from an ontology based on an intention class ( 2001 ) that characterises the purpose of each reference action, an activity type class ( 2006 ) that qualifies the nature of each reference action, a movement class ( 2003 ) that characterises the means for implementing each reference action, a target class ( 2002 ) that characterises the object of each reference action and a gain class ( 2005 ) that characterises the result of each reference action; and for each given message, disassembling said given message in a database formed by the intention class, the activity type class, the movement class, the target class and the gain class; comparing the disassembled message with at least one reference event category; generating at least one standardised event representing a correspondence between the disassembled message and the reference event category.