We have just heard two very different approaches to the establishment of cooperative collection development among libraries. California started with a very specific goal for a specific group of similar libraries. New York, on the other hand, started with an inducement to develop a collection sharing plan within an established regional system of multi-type libraries. Given these very different starting points the two efforts have very much in common. Both states have experienced reasonable success in achieving their goals. Both states are still providing funds to support the activity. Both systems have grown by the addition of private institution libraries. Both report that inter-library relationships have improved as a result of their experience.