A Framework for The Blackboard Model

ems which support some difficult problem-solving techniques: . Dynamic control: incremental formation of the solution is the norm; at each step, new rules may be triggered. . Focus of attention: there is no rigidity in the direction of resolution; work proceeds at various levels of abstraction, interleaving steps of forward and backward chaining, and goals can vary over time. . Flexibility of control: the resolution procedure can be codified in simple, independent control rules, or in complex control regimes ("the right knowledge can be applied at the right time"). . Island driving: the entire current best hypothesis is visible to the knowledge sources; promising parts of the resolution space can be treated as islands, with the additional goal of building bridges between such islands. . Concurrent resolution: the use of multiple knowledge sources is conducive to parallelization of the code and the pursuit