Hello PyPy, apart from the new "architecture" document the Amsterdam Sprint also produced a "goals" document which i now think should be rewritten to be (much) more higher level. See here for reference http://codespeak.net/pypy/index.cgi?doc/goals As it stands it's IMHO very confusing to understand from this document what PyPy aims at. I guess the current 'goals' document is more like an extensive "todo list" and maybe should just be renamed. (Because from a Todo-document one a) doesn't expect to understand everything at once and b) expects more lower level details). Apart from this little renaming we also concluded earlier that we want to have a "Status" document which should offer precise information about the implementation/concept status regarding our "components": interpreter, standard/flow/trace/trivial object spaces, annotation and translation. Each of these components should then have a list of main pieces wrong, missing, incomplete or (yes they exist!) complete. Btw, Armin has in the last days added/modified a chapter about Multimethods and Annotations (type inference): http://codespeak.net/pypy/index.cgi?doc/objspace/multimethod http://codespeak.net/pypy/index.cgi?doc/translation/annotation but don't forget to read the architecture document first in case you e.g. stumble on the term "object space" and don't know what it means :-) http://codespeak.net/pypy/index.cgi?doc/architecture cheers and some happy last days of the year, holger