A blackboard system is composed of an area of shared memory, referred to as the blackboard, that contains a problem to be solved and a collection of software agents or processes that can access and modify the blackboard. 

Each agent scans the changes to the blackboard, and posts an updated partial solution based on the state of the blackboard whenever its own internal conditions for doing so are met. These partial solutions cause other agents to update their portions of the solution on the blackboard until eventually an answer is found. In this fashion, the agents work together to solve the problem.

The blackboard architecture appears to resemble human cognition and is often proposed as a cognitive science model. Famous examples are the Hearsay II speech recognition system and Douglas Hofstadter's Copycat and Numbo projects.

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