Note to galaxylogic: When lispm wrote: (defmethod foo ((p person) (s string)) (list p s)) He was implicitly defining a "generic func

Note to galaxylogic: When lispm wrote: (defmethod foo ((p person) (s string)) (list p s)) He was implicitly defining a "generic function" "foo" of two arguments. Defmethod was defining an implementation of the generic function foo for arguments person with string. One could later put something like: (defmethod foo ((p person) (p person)) (send-greeting p p)) And thus define a "foo" that works on two persons, etc. CLOS allows specializing not just on classes, but also on specific instances, so some method applies only for a specific instance. For example a "foo" that applies only to a particular "important" person.