CALLAS is based on a three-layer structure that maps the general objectives into operational areas

- The CALLAS Shelf : a library of multimodal components developed and made available from the Consortium partners , starting from state-of-the-art technologies, improved and transformed into exploitable components.
- The CALLAS Framework : a plug-in architecture for the interoperability between the components, allowing multimodal applications developers to combine them at design time, providing significant cost reduction as well as quality of software improvement.
- The CALLAS Showcase : experimental applications using the CALLAS Framework to demonstrate how successful the technology is in conveying affectiveness and augmenting the people experience in different interactive spaces.
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