This document discusses DataActiva's approach to customer segmentation. It describes different levels and types of segmentation including mass, segmented, individual, and targeted segmentation. It also covers segmentation description techniques like a priori, cluster-based, and hybrid models. The document provides an overview of cluster analysis techniques including hierarchical, non-hierarchical, k-means, and Ward's methods. It discusses best practices for variable selection, standardization, response style effects, number of clusters, and validity checks in segmentation analysis. Finally, it notes how segmentation can be activated through customer relationship management processes and linked to other data sources.