Dear colleague: The ACA (Applications of Computer Algebra) conference has taken place for several years now: 1995-New Mexico, 1996-Austria, 1997-Hawaii, 1998-Czech Republic, 1999-Spain, 2000-Russia; and will be back to New Mexico in 2001 (May 31-June 3, 2001; see http://math.unm.edu/ACA/2001/2001.html for details). From 1996 onwards we have chaired a session (with a slightly changing title) devoted to ``Non-Standard Applications of Computer Algebra''. The session traditionally collected contributions that, while using Computer Algebra techniques and/or Computer Algebra Systems, could not be easily allocated in the ``standard'' sessions. Examples of topics treated in papers presented in previous editions of the conference are: Verification of Expert Systems, Development of Expert Systems, Railway Traffic Control, Artificial Intelligence, Thermodynamics, Molecular Dynamics, Statistics, Electrical Networks, Logic, Robotics, Sociology, ... We are organising again in 2001 the session: NON-STANDARD APPLICATIONS OF COMPUTER ALGEBRA Submissions of works in this area are welcome. If you are interested in submitting a paper, please send an e-mail message to both of us, including a tentative title and a 1 to 2 pages long abstract with a general description of your work. Although the general proceedings are published ``only'' in electronic form, articles corresponding to the presentations in this session in 1996-1997 and in 1998-1999 have been published in ``Mathematics and Computers in Simulation'' (Transactions of IMACS) journal (volumes 45/1-2 and 51/5, respectively). We'll try to have the articles accepted in this session compiled in another special volume too. Sincerely, Dr. Eugenio Roanes-Lozano, Universidad Complutense de Madrid (eroanes@eucmos.sim.ucm.es) Dr. Michael Wester, University of New Mexico (wester@math.unm.edu)