1. Move the topic descendants/ascendants and other functions out of the Topic Model and into the Topic Controller 2. Recreate the descendants function for topics? This function needs to return a flat list of the recursive parent of a topic. 3. Read over Andrew's code, although it's probably perfect. (of course it is -Andrew) 4. Consider merging the Topic and Tree Controllers? Or creating a Topic Repository? Is this what a Topic Repository is for? Maybe?