Unifying MAS MetaModels ADELFE, Gaia - PowerPoint PPT Presentation

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Unifying MAS MetaModels ADELFE, Gaia

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Title: Unifying MAS MetaModels ADELFE, Gaia


1
Unifying MAS Meta-Models ADELFE, Gaia PASSI
  • Carole Bernon, Massimo Cossentino, Marie-Pierre
    Gleizes, Paola Turci and Franco Zambonelli

2
Agent-Oriented vs. Object-Oriented
  • Design a system ? Instantiate a meta-model
  • OO context - design rely on a common denominator
  • Universally accepted concept of object and
    related meta-model of object-oriented systems
  • AO context - to date, no common denominator
  • Each methodology has its own concepts and system
    structure

In the agent world the meta-model is the
critical element when applying the method
engineering paradigm
3
Reasons to Unify
  • Meta-model means to unify concepts
  • Unique meta-model, a way of unifying the
    different concepts
  • Helping designer to build a meta-model depending
    on the system he needs
  • Choice of useful elements
  • From the omni-comprehensive MAS meta-model
  • Composition of process
  • Method fragment selection phase
  • Model coherence checking by CASE tools
  • Unification eases model transformation

4
MAS Meta-Model for ADELFE
  • no predefined organization
  • local goal
  • cooperative
  • detect and remove NCS

5
Gaia Methodology
  • First version
  • Designed to handle small-scale, closed
    agent-based systems
  • Modelled agents, roles, interactions
  • Missed in modelling explicitly the social aspects
    of a MAS
  • Official extension of Gaia
  • Thought for open agent systems
  • Focused on the social organization of the system

6
MAS Meta-Model for Gaia
7
MAS Meta-Model for PASSI
8
Towards a Unifying MAS Meta-Model
  • In order to define a unifying meta-model we will
    consider the following specific aspects
  • Agent structure
  • Agent interactions
  • Agent society and organizational structure
  • Agent implementation

9
Agent Structure
  • ADELFE cooperative agents
  • Gaia and PASSI composition of roles

10
Agent Structure - Considerations
  • None imposes a specific classical agent
    architecture
  • Seen as some kind of low level architectures that
    can be adopted during MAS implementation
  • None explicitly deals with goals and plans
  • ADELFE
  • Notion of goal is only used to determine skills
  • Plans are built at run-time by the system
  • Gaia
  • The concept of goal is implicit in roles
  • Plans play no explicit role
  • PASSI
  • Goals are considered as non functional
    requirements
  • Plans are modelled as algorithms (activity
    diagrams)

11
Agent Interactions
  • No relevant differences

12
Agent Interactions
  • No relevant differences
  • ADELFE agents can communicate indirectly using
    environment
  • Gaia communication mediated by the environment
    seen as a side effect

13
Agent Interactions
  • No relevant differences
  • ADELFE agents can communicate indirectly using
    environment
  • Gaia communication mediated by the environment
    seen as a side effect
  • ADELFE ontologies have not to be modelled
    agents are able to adapt to the environment and
    other agents

14
Agent Society and Organizational Structure
  • ADELFE no predefined organization

15
Agent Society and Organizational Structure
  • ADELFE no predefined organization
  • Gaia organization primary abstraction
  • PASSI services and scenarios

16
Agent Implementation
  • ADELFE
  • The problem of the system implementation has not
    been treated yet no platform has been imposed
  • Gaia
  • Totally abstract from implementation
  • PASSI
  • FIPA compliant systems
  • Direct map among the most important elements of
    the model and their implementation

17
Proposal for a Unifying Meta-model
18
Conclusion
  • Societies with or without predefined
    organizations (open systems)
  • Generic agent (cooperative or not)
  • Follows organizational or cooperation rules
  • Possibility of identifying three domains
  • Improvements an agent has a representation of
    the environment expressed via an ontological
    model
  • Step towards a unique meta-model
  • A unifying framework for the systems produced
    with different approaches

19
Open Questions
  • Can a unique meta-model exist?
  • What description level has to be reached?
  • How may designers choose meta-model elements?
  • What kind of tools may ease their work?
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