A method for analyzing transmitted protocol data units of a protocol for communication between two object request brokers to obtain a representation of messages included in the transmitted protocol data units includes collecting and correlating incomplete sets of information derived from the individual protocol data units for respective objects, and obtaining, from a plurality of necessary conditions, an adequate selection criterion for an interface definition to be used in a decoding operation. The decoding operation is performed using an initialization phase, a learning phase and a decoding phase. The initialization phase includes forming at least one list of possible interface definitions. The learning phase includes introducing exclusion criteria for reducing a number of the possible interface definitions so as to uniquely determine which interface definition underlies a first object. The decoding phase includes decoding a first message transmitted from or to the first object.
