I just want to get my basics right! this statement is something that i see everywhere. 1. Both of them provide a Object view of the persistant store. 2. JDO is lightweight because it does not involve 3 interfaces ? :-) to represent. 3. Entity bean model essentially loses out on performance because of the life cycle methods that a container needs to invoke? Can somebody confirm if 3) is one of the reasons an entity bean is slower than other mechanisms? If that is the case, can this call back specifications be refined to make it work faster?