A computer-implemented method for determining compatibilities of a plurality of computer systems for consolidation of said computer systems, said method comprising: - obtaining configuration data for each of said plurality of systems, said configuration data relating to technical parameters of a corresponding one of said plurality of systems; - generating a configuration compatibility score for each pair of said plurality of systems by comparing configuration data for respective ones of said pair of said plurality of systems according to predetermined rule sets to detect system incompatibilities by evaluating differences between said technical parameters for said pair of systems, and computing said configuration compatibility score according to weights in the predetermined rule sets defining what is important for determining compatibility; - obtaining workload data for each of said plurality of systems, said workload data defining workload capabilities and/or utilization of a corresponding one of said plurality of systems; - generating a workload compatibility score for each pair of said plurality of systems by analyzing workload data for respective ones of said pair of said plurality of systems to determine workload compatibilities between each pair of said plurality of systems by evaluating combined workloads resulting from combining the workloads of the pair of systems; - generating an overall compatibility score for each pair of said plurality of systems using the respective configuration compatibility score and workload compatibility score for that pair; - enabling at least one of a set of said configuration compatibility scores and a set of said workload compatibility scores to be output to provide measures of compatibilities of different pairs of said plurality of systems based on the corresponding score; - outputting a set of said overall compatibility scores to provide measures of overall compatibilities of different pairs of said plurality of systems based on the corresponding score; and - based on the compatibility scores, performing consolidation by: - determining one or more candidate transfer sets each indicating one or more of the computer systems capable of being transferred to a target computer system; - selecting a desired one of the one or more candidate transfer sets; and - wherein a transfer set comprises moving of one or more source entities onto one or more targets. - obtaining configuration data for each of said plurality of systems, said configuration data relating to technical parameters of a corresponding one of said plurality of systems; - generating a configuration compatibility score for each pair of said plurality of systems by comparing configuration data for respective ones of said pair of said plurality of systems according to predetermined rule sets to detect system incompatibilities by evaluating differences between said technical parameters for said pair of systems, and computing said configuration compatibility score according to weights in the predetermined rule sets defining what is important for determining compatibility; - obtaining workload data for each of said plurality of systems, said workload data defining workload capabilities and/or utilization of a corresponding one of said plurality of systems; - generating a workload compatibility score for each pair of said plurality of systems by analyzing workload data for respective ones of said pair of said plurality of systems to determine workload compatibilities between each pair of said plurality of systems by evaluating combined workloads resulting from combining the workloads of the pair of systems; - generating an overall compatibility score for each pair of said plurality of systems using the respective configuration compatibility score and workload compatibility score for that pair; - enabling at least one of a set of said configuration compatibility scores and a set of said workload compatibility scores to be output to provide measures of compatibilities of different pairs of said plurality of systems based on the corresponding score; - outputting a set of said overall compatibility scores to provide measures of overall compatibilities of different pairs of said plurality of systems based on the corresponding score; and - based on the compatibility scores, performing consolidation by: - determining one or more candidate transfer sets each indicating one or more of the computer systems capable of being transferred to a target computer system; - selecting a desired one of the one or more candidate transfer sets; and - wherein a transfer set comprises moving of one or more source entities onto one or more targets. - determining one or more candidate transfer sets each indicating one or more of the computer systems capable of being transferred to a target computer system; - selecting a desired one of the one or more candidate transfer sets; and - wherein a transfer set comprises moving of one or more source entities onto one or more targets.