Here we present our use cases that we envision for WAF (our prototype). There are six use cases in total of which four were actually implemented in the prototype and the remaining two were thought of, but not taken into account for the current version of WAF. To note: requirements, claims or IDP columns that are filled in with a - (hyphen) are there to indicate that there is no requirement, claim or interaction design pattern (IDP) belonging to that specific Use Case (UC) step.
Use Case 1: User takes a normal walk without caretakers
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Objective
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Allow people with dementia to take a walk without caretakers.
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TDP
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Human in charge
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Actors
| Person with Dementia (PwD), WAF
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Pre-condition
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PwD wants to take a walk.
WAF is ready to lead the PwD.
The walking route is already set by the activity coordinator.
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Post-condition
| PwD has taken a walk without any human assistance and has safely returned to their room.
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Action sequence
| UC steps:
1. PwD equips the proximity bracelet and gets ready to go.
2. WAF guides the PwD during the walk.
3. PwD arrives home safely.
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UC step
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Requirements
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Claims
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IDP
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| 1 | - | - | - |
| 2 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | |
| 3 | WAF can lead the way back home | - | Guiding the human while walking pattern |
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Use Case 2: User gets distracted while taking a walk
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Objective
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Allow people with dementia to take a walk without a caretaker.
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TDP
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Human lost
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Actors
| Person with Dementia (PwD), WAF
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Pre-condition
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PwD wants to take a walk.
WAF ready to lead the human.
The walking route is already set.
PwD already wears the proximity bracelet.
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Post-condition
| PwD has taken a walk and is happily home now.
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Action sequence
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UC steps:
1. PwD takes a walk, WAF guides PwD during the walk.
2. PwD gets lost, WAF stops.
3. WAF tries to get PwD's attention.
4. WAF regains PwD's attention and they continue walking together.
5. PwD arrives home safely.
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UC step
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Requirements
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Claims
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IDP
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| 1 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
| 2 | WAF can detect if the PwD is too far away | - | Guiding human back pattern |
| 3 | WAF can make sounds and perform dog-like movements | WAF can grab the attention of a PwD when needed and with minimal annoyance. | Getting attention pattern |
| 4 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
| 5 | - | - | - |
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Use Case 3: User walks away while taking a walk
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Objective
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Allow people with dementia to take a walk without caretakers.
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TDP
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Human lost (& Caretaker Called)
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Actors
| Person with Dementia (PwD), WAF, Caretaker
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Pre-condition
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PwD wants to take a walk.
WAF is ready to guide the human.
The walking route is already set.
PwD already wears the proximity bracelet.
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Post-condition
| PwD has taken a walk and is safely home now.
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Action sequence
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UC steps:
1. PwD takes a walk, WAF guides PwD during the walk.
2. PwD walks away, WAF stops.
3. WAF tries to get PwD's attention.
4. WAF fails to regain PwD's attention and notifies caretaker.
5. Caretaker arrives and guides PwD back home safely.
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UC step
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Requirements
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Claims
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IDP
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| 1 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
| 2 | WAF can detect if the PwD is too far away | - | Guiding human back pattern |
| 3 | WAF can make sounds and perform dog-like movements | WAF can grab the attention of a PwD when needed and with minimal annoyance. | Getting attention pattern |
| 4 | WAF can notify caretakers | - | - |
| 5 | - | - | - |
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Use Case 4: User takes a break or talks to someone
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Objective
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Allow people with dementia to take a walk without a caretaker.
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TDP
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Human in Charge
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Actors
| Person with Dementia (PwD), WAF, Other Person
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Pre-condition
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PwD wants to take a walk.
WAF ready to lead the human.
The walking route is already set.
PwD already wears the proximity bracelet.
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Post-condition
| PwD has taken a walk and is happily home now.
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Action sequence
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UC steps:
1. PwD takes a walk, WAF guides PwD during the walk.
2. PwD gets tired or notices someone, WAF stops.
3. PwD stays in the same place for a while.
4. PwD decides to start walking again.
5. WAF continues to guide the PwD.
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UC step
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Requirements
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Claims
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IDP
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| 1 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
| 2 | WAF can detect if the PwD has stopped | - | - |
| 3 | WAF can make minor movements to not look completely stationary | - | - |
| 4 | WAF can notice PwD has stopped taking a break | A PwD feels increased freedom to take breaks and to interact in a social context during a walk with WAF in comparison with a caretaker. | - |
| 5 | WAF can keep following the set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
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Use Case 5: User falls while taking a walk
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Objective
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Allow people with dementia to take a walk without caretakers.
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TDP
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Caretaker Called
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Actors
| Person with Dementia (PwD), WAF, Caretaker
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Pre-condition
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PwD wants to take a walk.
WAF is already present in the room.
The walking route has already been set.
PwD already wears the proximity bracelet.
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Post-condition
| PwD has taken a walk and made it home safely.
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Action sequence
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UC steps:
1. PwD takes a walk, WAF guides PwD during the walk.
2. PwD falls and cannot get up, WAF stops.
3. WAF notifies caretaker.
4. Caretaker arrives and helps PwD.
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UC step
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Requirements
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Claims
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IDP
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| 1 | WAF can guide the PwD along a set route | A PwD experiences an increase in perceived autonomy compared to walking with a caretaker. | Guiding the human while walking pattern |
| 2 | WAF can detect if PwD needs help | - | - |
| 3 | WAF can notify caretakers | - | - |
| 4 | - | - | - |
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Future work: snoezelen
Use Case 6: User that likes dogs snoezels with WAF
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Objective
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Provide people with dementia a companion.
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TDP
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Human in charge
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Actors
| Person with Dementia (PwD), WAF
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Pre-condition
| WAF is already in the room.
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Post-condition
| PwD has bonded with WAF.
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Action sequence
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UC steps:
1. WAF is placed in front of a PwD.
2. PwD pets WAF's head and body, WAF reacts positively.
3. PwD feels better.
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UC step
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Requirements
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Claims
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IDP
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| 1 | - | - | - |
| 2 | WAF can react positively to snoezelen | - | - |
| 3 | - | PwD will become either more relaxed at best or not bothered at worst | - |
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Use Case 7: User that dislikes dogs snoezels with WAF
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Objective
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Provide people with dementia a companion.
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TDP
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Human in charge
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Actors
| Person with Dementia (PwD), WAF
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Pre-condition
| WAF is already in the room.
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Post-condition
| PwD has not bonded with WAF.
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Action sequence
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UC steps:
1. WAF is placed in front of a PwD.
2. PwD pets WAF's head and body, WAF reacts positively.
3. PwD doesn't feel better than before.
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UC step
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Requirements
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Claims
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IDP
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| 1 | - | - | - |
| 2 | WAF can react positively to snoezelen | - | - |
| 3 | - | PwD will become either more relaxed at best or not bothered at worst | - |
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