There is a list of interest sources that could get the attention of a number of agents in the world. That list is kept in a manager that handles the global update for every source, taking into account just the active ones.
An interest source receives the list of agents in the world and retrieves only the affected agents after a two-step process. First, it sets aside all the agents that are outside its action radius and then only takes into account those agents that can be reached with a finer (and more expensive) sensory-level mechanism.
The manager handles the affected agents, sets up scouts and their leader, and finally informs all of them about their relevant interests.
