A computer-implemented method for deploying a decision service to a target managed system, wherein the method is executed by a business rule service package having been installed on the target managed system as a plug-in interfacing with the decision service manager, the plug-in further interfaces with one or more client computers, the method comprising: - receiving authentication data from a decision service manager, wherein the decision service manager is a centralized system management suite or a module thereof which controls the deployment of a plurality of decision services to a plurality of managed systems; - receiving a status request from the decision service manager; - in case of a successful verification of the authentication data, collecting data being indicative of the current status of the managed system; - returning the collected data to the decision service manager for enabling the decision service manager for performing a deployment readiness check; - receiving the decision service from the decision service manager in case the deployment readiness check returns as a result that the target managed system is operable to host the decision service; - upon deployment of the decision service, evaluating a service description file of the decision service received by the target managed system; - extracting an availability period being indicative when the deployed decision service is permitted to execute on the target managed system; storing the extracted availability period in association with an identifier of the deployed decision service in a mapping contained in a service catalog, the mapping being a mapping of decision services currently deployed in the target managed system and respective availability periods of said decision services; the method further comprising: - receiving a service call from one of the one or more client computers, the service call requesting a service provided by the deployed decision service; - extracting a service time from the service call; - accessing the service catalog; - calling, by the business rule service package, the requested decision service if its assigned availability period according to the mapping covers the service time, and returning a result of the called decision service to the client computer; - if the availability period assigned to the requested decision service does not cover the service time, denying execution of the service request; wherein in case the decision service requested depends or interacts with other decision services deployed on the target managed system, the availability times assigned to said other decision services in the mapping are also required to cover the requested service time as otherwise the service is not executed; and wherein at least one decision service is deployed to the target managed system in two or more different versions, each version having assigned a respective availability period not overlapping with the availability periods of other versions of said decision service, the business rule service package being adapted to identify the version of the requested decision service covering the requested service time and to selectively call said decision service version for processing the service request. - receiving authentication data from a decision service manager, wherein the decision service manager is a centralized system management suite or a module thereof which controls the deployment of a plurality of decision services to a plurality of managed systems; - receiving a status request from the decision service manager; - in case of a successful verification of the authentication data, collecting data being indicative of the current status of the managed system; - returning the collected data to the decision service manager for enabling the decision service manager for performing a deployment readiness check; - receiving the decision service from the decision service manager in case the deployment readiness check returns as a result that the target managed system is operable to host the decision service; - upon deployment of the decision service, evaluating a service description file of the decision service received by the target managed system; - extracting an availability period being indicative when the deployed decision service is permitted to execute on the target managed system; - receiving a service call from one of the one or more client computers, the service call requesting a service provided by the deployed decision service; - extracting a service time from the service call; - accessing the service catalog; - calling, by the business rule service package, the requested decision service if its assigned availability period according to the mapping covers the service time, and returning a result of the called decision service to the client computer; - if the availability period assigned to the requested decision service does not cover the service time, denying execution of the service request;