Hi, not sure if I'm tearing down open doors here, as we say in German, and this has probably been mentioned before, but I think we should have a way of returning a 'model' kind of thing from a function package. What I mean is a collection of pre-defined results like the whole bunch of accessor values after estimation ($xlist, $coeff, $vcv etc.) that can be used by the caller of the function package. In a sense, it's like gretl's model table mechanism applied to functions. This could of course be done by stuffing everything into and returning a hansl bundle, but then I would say we should have a written-down convention on how to structure such a bundle. For example, it could be mandatory to include a bundle member named 'is_model' with value 1 or somesuch, so that a bundle can be recognized as holding model results. I think this would make it easier to extend gretl via user-contributed function packages. It doesn't mean that package authors would be required to return a bundle, but it could be made mandatory for add-ons etc. (perhaps it already is?). Any reactions? thanks, sven