Hi all, The function "strong_components" produces a mapping from vertex to component - but what I need is a mapping the other way, from component to vertex! Now of course I could go through the property_map, query each vertex, and create the new map myself, but theres got to be a better way. The map is just a writable_property_map concept, so theoretically I should be able to create my own somehow that will swap the key and value, but I'm not sure how I would do that. Any suggestions? I also want to create a graph of the strongly connected components, but I suppose theres no tricky way to do this - just go through each vertex in the returned map and add its connections to the strong component's connections (though there's probably something tricky I could do with iterators to make this automatic) Thanks for any help, my mind is still adjusting to being warped by this generic programming stuff :)