We discuss two aspects of polarisation in hard exclusive meson production:
the leading-twist selection rule for the meson helicity, and the different
partial waves of a (pi pi)-pair which may or may not be due to the decay of a
rho.Comment: 9 pages, 1 figure. Talk given at the Workshop on Exclusive and
Semiexclusive Processes at High Momentum Transfer, Jefferson Lab, May 1999.
Remark added on the transition from two gluons to a pion pai
