Belief-Desire-Intention

• The Belief Desire Intention Model is a model for agent programming where agents have

  • Beliefs - the informational state of the agent, including rules and heuristics that it has.
  • Desires - the objectives or goals of the agent.
  • Intentions - the actions that the agents have chosen to do. This presupposes planning.

• Events in the system modify the agent’s beliefs, plans, and goals.

• Optionally, agents may have Obligations — norms and commitments

• The BDI architecture also provides three behavior structures

  • Perception - the agents can perceive their environment and update their beliefs accordingly.
  • Rule - a function to infer new desires or beliefs from the current desire and beliefs.
  • Plans - behaviors used to accomplish specific intentions.

• The general pipeline for behavior is as follows

  • Execute perceptions
  • Execute rules.
  • Check if the current intention is achieved
    • If an intention is achieved, set the current plan to NULL and remove it from the intention base
    • If the achieved intention’s super-intention is on hold, it is reactivated.
  • Check if the current intention is to be kept.
  • Check for a plan
    • If there is a plan, execute it.
    • If the plan has been persistent for a while, drop it with a certain probability and formulate a new plan later.
  • Check for desires.
    • If the current intention is on hold, choose a desire as a new intention.
  • Choose a plan as a new current plan. Preferably, choose the plan with highest priority
  • Execute the plan.
  • Check if the plan was finished.

Links §

• Faculties of the Mind -the goal of BDI is to simulate intelligent behavior
• GAMA Platform — BDI Architecture