Clustering is one of the most popular tasks in knowledge discovery and is applied in various domains (e.g., data mining, pattern recognition, computer vision, etc.). Clustering methods seek to organize a set of items into clusters such that items within a given cluster have a high degree of similarity, whereas items belonging to diﬀerent clusters have a high degree of dissimilarity. Partitioning clustering methods ([114, 148, 175]) aim to obtain a single partition of the input data into a ﬁxed number of clusters. Such methods often look for a partition that optimizes (usually locally) an adequacy criterion function. Clustering techniques have been widely studied across several disciplines, but only a few of the techniques developed scale to support clustering of very large time-changing data streams (Madjid & Norwati 2010 ) (Mahdiraji 2009 ). The major challenge in clustering of evolving data is to handle cluster evolution: new clusters may appear, old ones may disappear, merge or split over time.