SAIBA Multimodal Behavior Generation Framework

The overall goal of this international effort is to unify a multimodal behavior generation framework for Embodied Conversational Agents (ECAs) so that people in the field can more easily work together and share resources.

So far the following research centers and institutions actively participate in the effort (alphabetical):

• Articulab, Northwestern University, USA
• Artificial Intelligence Group, University of Bielefeld, Germany
• Austrian Research Institute for AI (OFAI), Vienna, Austria
• Center for Analysis and Design of Intelligent Agents (CADIA), Reykjavik University, Iceland
• Center for Human Modeling and Simulation, University of Pennsylvania, USA
• Deutsches Forschungszentrum für Künstliche Intelligenz (DFKA), Germany
• Human Media Interaction, University of Twente, The Netherlands
• Human-Oriented Technology Lab, University of Zagreb, Croatia
• Information Sciences Institute (ISI), University of Southern California, USA
• Institute for Creative Technologies (ICT), University of Southern California, USA
• Intelligent Agents and Synthetic Characters Group at INESC, Lisbon, Portugal
• IUT de Montreuil, University de Paris 8, France

The first step towards a unifying representational framework for multimodal generation has been to lay down the general planning stages and knowledge structures that are involved in the creation of multimodal communicative behavior. We do not want to impose a particular micro-architecture. Yet, as our goal is to define representation languages that can serve as clear interfaces at separate levels of abstraction—building upon our experiences from previous ECA systems—we need to modularize the problem.

We aim for the representation languages to be:

1. Independent of a particular application or domain
2. Independent of the employed graphics and sound player model
3. Represent a clear-cut separation between information types (function-related versus process-related specification of behavior)

The generation of natural multimodal output requires a time-critical production process with high flexibility. To scaffold this production process we introduced the SAIBA framework (Situation, Agent, Intention, Behavior, Animation), and specify the macro-scale multimodal generation consisting of processing stages on three different levels:

1. Planning of a communicative intent
2. Planning of multimodal behaviors that carry out this intent
3. Realization of the planned behaviors

These processing stages are depicted below:

The interface between stages (1) and (2) — Intent Planning and Behavior Planning — describes communicative and expressive intent without any reference to physical behavior. We call the language that we propose for specifying such information the Function Markup Language (FML). It is meant to provide a semantic description that accounts for the aspects that are relevant and influential in the planning of verbal and nonverbal behavior.

The interface between (2) and (3) — Behavior Planning and Behavior Realization — describes multimodal behaviors as they are to be realized by the final stage of the generation process. We propose the Behavior Markup Language (BML) for this purpose. It provides a general, player-independent description of multimodal behavior that can be used to control an embodied agent. Nevertheless, it needs to provide a sufficient level of detail in describing behavior, from the mere occurrence and the relative timing of the involved actions, to the detailed definition of a behavior’s form.

The 3rd BML Workshop, hosted by MITRE Corporation, Boston, USA, June 2-3, 2008

The 1st FML Workshop (at AAMAS 2008)
Estoril, Portugal, June 13, 2008

The 2nd BML Workshop (following the HUMAINE plenary meeting)
Paris, France, June 7-8, 2007

HUMAINE WP10 Joint Workshop on Representations for Multimodal Behavior
Vienna, Austria, November 7-8, 2006

Representations for Multimodal Generation Workshop
Reykjavík University, Reykjavík, April 23-25, 2005

Embodied conversational agents - let's specify and evaluate them!
Bologna, Italy, 16 July, 2002