A computer system arrangement for minimizing communication and integration complexity between a plurality of software applications having each an individual data model defining an individual set of application parameters, includes a bus arrangement having connections to each one of said plurality of applications, the bus being arranged to interpret between each application and to orchestrate incoming and outgoing requests from each application, the bus arrangement including, a generic information model defining a set of generic parameters in relation to the application parameters of each application, an adaptor together with said generic information model, in connection with an incoming request, arranged to map parameters of that individual data model to said generic parameters, a device arranged to transfer the mapped generic information model together with the request to a process execution engine, which includes a device arranged to handle the request to identify a corresponding adaptor to which the request was directed, and using the corresponding adaptor together with the generic information model to remap the request to the individual data model of the application to which it is was directed.