The i-Walker: An Intelligent Pedestrian Mobility Aid - Computational Intelligence in Healthcare: Advanced Methodologies - page 109

in either good or bad way or just can have a good/bad day driving-wise. The knowledge
learnt by each agent would be shared and distributed among other agents that have users
with similar profiles so they can take advantage of the experiences traced by the first
one. Agent's responsibility grows with the measure of his active intervention in the
user's autonomy is exerted. This means a heavier charge of obligations regarding safety
and soundness in the undertaken actions [8].

5 Generic Scenarios

Devices have been used to assist people with cognitive and/or physical disabilities to
complete various tasks for almost 20 years. What represents a change and challenge are
the abilities embedded in a new generation of tools that are able to cooperate with the
user to complete a task. This implies that these new tools are context-aware and are able
to learn from the interaction with the user.
Cooperation for problem solving between users and their agent and the cooperation
between agents among themselves requires some kind of model which at least describes
what to expect from whom in terms of questions, actions, etc and that uses previous
experiences and trust.
Scenarios appear to be an easy and appropriate way to create partitions of the world
and to relate them with time. Scenarios allow actions to be performed in a given time.
For example, Mihailidis et al. , in [20], studied the handwashing scenario where a full
instrumented environment was used to provide users with cues to support the comple-
tion of this task.
As in Mihalilidis' approach we are looking to support those tasks that are needed
to perform the most important ADLs. In particular, those related with mobility but
not only.

5.1 Scenarios in SHARE-it

A scenario is an example narrative description of typical interactions of the users with
the system. There are several types of scenarios [5]:

- As-is scenarios , which describe the current situation.
- Visionary scenarios , which describe the future system. This is the main communi-
cation tool between the application and solution domain experts. In a sense, these
scenarios are inexpensive prototypes.
- Evaluation scenarios , which are used to test if the system provides the desired
functionality.

Scenarios are concrete, informal descriptions, and are not intended to describe all
possible interactions [3]. In SHARE-it we defined 9 scenarios in here we will describe
only a simplified version of them. For each scenario, we describe the following aspects:

Purpose of the scenario describes which aspects of the system and its interactions
with the user are focused by the scenario.