R package RcmdrPlugin.FuzzyClust. The R Commander Plug-in for Fuzzy Clustering Methods. This Plug- in provide Graphical User Interface of 2 methods of Fuzzy Clustering (Fuzzy C- Means /FCM and Gustafson Kessel-Babuska). For validation of clustering, this plug- in use Xie Beni Index, MPC index, and CE index. For statistical test (test of significant differences of grouping/clustering), this plug-in use MANOVA analysis with Pillai trace statistics. For stabilize the result, this package provide soft voting cluster ensemble function. Visualization of result are provided via plugin that must be load in Rcmdr file.