A computer-implemented method for managing participants of a marketing campaign is disclosed. The method includes generating a marketing campaign with multiple tracks. Each track comprises one or more steps that indicate an activity executed on campaign participants. The method also includes generating segmentation conditions based on natural language statements. Each segmentation condition includes a rule and a time condition. Additionally, the method includes associating a campaign participant from a first track to a second track if behavior information satisfies a segmentation condition. The behavior information includes a response by the campaign participant to an activity indicated by a step in the first track.