  We present a new procedure for the identification of moving groups. It is a
combination of two independent member selection methods. One is a modern
implementation of a classical convergent point method for proper motion data.
The other objectively identifies moving groups in velocity space using proper
motions and parallaxes. We briefly describe both methods, and illustrate their
power by applying them to Hipparcos measurements of a field containing the
Upper Scorpius subgroup of the Scorpio-Centaurus association (Sco OB2). We show
how our membership selection procedure not only improves the list of previously
known B and A-type members, but also identifies many new members, including a
significant number of F stars. We apply our procedure to other nearby OB
associations elsewhere in these proceedings (Hoogerwerf et al.; de Zeeuw et
al.).
