This communication describes a free toolbox for MATLAB(R) for analysis of multiway data. The toolbox is called "The N-way Toolbox for MATLAB" and is available on the internet at http://www.models.kvl.dk/source/. This communication is by no means an attempt to summarize or review the extensive work done in multiway data analysis but is intended solely for informing the reader of the existence, functionality, and applicability of the N-way Toolbox for MATLAB. (C) 2000 Elsevier Science B.V. All rights reserved.