  A new method to identify coherent structures in velocity space --- moving
groups --- in astrometric catalogues is presented: the Spaghetti method. It
relies on positions, parallaxes, and proper motions and is ideally suited to
search for moving groups in the Hipparcos Catalogue. No radial velocity
information is required.
  The method has been tested extensively on synthetic data, and applied to the
Hipparcos measurements for the Hyades and IC2602 open clusters. The resulting
lists of members agree very well with those of Perryman et al. for the Hyades
and of Whiteoak and Braes for IC2602.
