The invention relates to a campaign management system (CAMS) comprising a plurality of participant records (PREC) and two or more process structure versions (PSV1, PSV2) of a process structure (PS) comprising a plurality of configured logic templates (CLT); wherein the campaign management system (CAMS) is computer-implemented and configured to process said participant records (PREC) according to said process structure versions (PSV1, PSV2) and wherein said participant records (PREC) comprise track histories (TH) of said processing; and wherein said campaign management system (CAMS) is configured to migrate said processing of said participant records (PREC) between said two or more process structure versions (PSV1, PSV2) on the basis of said track histories (TH) and said two or more process structure versions (PSV1, PSV2).