Hi I am trying to create a new ASDF:OPERATION, but I must be missing something and the manual (or Google) does not seem to help much. How do you create a new operation, which may be quite simple? Or better, how do you get PERFORM and/or OPERATE to actually do something for you. I know I should RTFM, but in this case it is more of a RTFC, which is far more difficult. I tried the following (defclass my-op (non-propagating-operation) ()) (defmethod perform ((o my-op) (s system)) (print 42)) (defmethod operate ((o my-op) (s system) &key &allow-other-keys) (print 666)) But then, doing cl-user 42> (operate 'my-op (find-system "somesys") :bar 1024) #<MY-OP > #<ASDF/PLAN:SEQUENTIAL-PLAN 2301B97B> is all I get. Any tutorial or advice? Thanks -- Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://dcb.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY