Multimodal Output Management - Man-Machine Dialogue: Design and Challenges - page 149

- the extent of the information, with, for example, a choice consisting of
showing all of the information, which might make it impossible to read, and
add a zoom on a focalized, and thus legible, part;
- the presentation constraints inherent to the multimedia information itself:
visual for cartography, without constraints for a message in natural language,
which can be displayed or verbalized.
The pragmatic aspects cover the illocutionary value and force discussed in
section 7.1.1, that is the dialogue act carried by the action of presenting, with
several levels depending on the marked or unmarked aspect of this act, as well
as the perlocutionary value and force, which reflect the effects carried out by
the expression of this dialogue act and that we will see in section 9.2. As we
saw with input processing and dialogue management, these pragmatic aspects
take on a meaning when they are linked to the dialogue structure, and thus to
the modeling of the multimodal history: a history of the messages exchanged,
ofthedatadisplayed, ofthedisplayactionscarriedout, toauthorizesubsequent
mentions of these actions.
A second set of parameters covers the presentation means and conditions.
The first set of parameters are essentially the characteristics of the terminal
used, especially the list of devices operating (speaker and touch screen) within
their limits, the availability of each of them and a whole set of constraints
on the transmission of information through them: dimension constraints such
as screen size, processing time constraints and constraints on the constitution
of information depending on the chosen modality. For the second set of
parameters, we suggest applying the three gesture functions identified by
Cadoz [CAD 94] to multimedia presentation to describe the gesture interaction
possibilities:
- epistemic constraints, linked to getting to know the environment: taking
into account the level of ambient noise, which is recorded by the microphone
and the level of ambient light, even the vibrations in the case of an MMD on
an airplane, at least if it has the correct sensors;
- ergotic constraints linked to the environment transformation: sound level
and light level beyond which the system cannot go in order to not disturb the
environment, which can be easily pictured in an office environment or a field
of operations involving several other systems and users;