HCDE 451: Paper Prototype


My paired app is a personal safety application called Guardian. The application aims to provide support for when smart watch users feel unsafe while traveling around various locations. Whether they are running, walking alone, or riding the bus, this app will add extra relief and prevent potential crime that may come about. The app works by notifying users of flagged crime zones and allowing them to request people from their contacts to watch over them throughout their journey. Smart watch users can communicate with their contacts, and in the case of an emergency, the smart watch’s motion sensors will detect and set off emergency alerts.

On the other side, individuals who have been requested to watch over someone can monitor their person through their smart phone and call for help if they notice any dangers. The smart phone application allows users to track their client’s location via GPS, communicate with their clients, and monitor their live biometric information to see if they are in danger.


For my smartwatch application, users can get a notification to open the application when they are entering a flagged area. They can request any number of individuals in their emergency contacts to watch over them either by tapping on their contact icons or voicing out who they want to watch over them. Users can then send out text or audio messages to their selected contacts to keep them updated. In the case that users are attacked, users can shake their arms and the smartwatch will set off loud sirens via their watch and cell phone, and automatically send distress signals to their contacts.

For the smart phone, users can switch between three functionalities. The first is a map view of their contact’s location. Users can spot nearby crime zones and safe zones. They can click on the safe zone pins on the map to send out directions to the nearby safe zone to their clients. Secondly, users can tap the metrics tab to view their client’s live heart rate and movement levels to see their client’s current status in case they do not respond. Lastly, users can send text or audio messages to their clients to check up on their clients.


In terms of my testing with a user, I found that the usability of the smartphone application was fairly intuitive. My participant was able to quickly track their contact’s location, biometrics, and respond to them in case of an emergency. My peers in class really liked the biometric feature and how the prototypes were large enough to see the visuals clearly. In terms of what needed improvement, I noticed that there was some difficulty using the smartwatch application. My participant found it difficult realizing that they were in a chat box where they could message their participants. They were confused as to whether they could send messages or if they should shake their wrists to alert their contacts since I added that tip on the same screen on the chat interface. Also, they thought that having a 911 button on the UI would be a good addition to contacting authorities quickly. In terms of my peers in class, they recommended that the prototype have less touch interaction since it behaves like a miniature smartphone. Instead, the smartwatch should use more of its motor movements, which would help decrease chances of theft. Overall, I learned that my design was fairly intuitive to use. I realize the difficulty in designing for a smartwatch considering the size of the screen. It was difficult thinking of what kinds of elements and interactions to have that would not overcrowd the app and make it less intuitive.

Participant requesting contacts to be their guardian
Participant having trouble identifying the chat screen
Participant sending out a reply to their contacts
Participant sending directions to safe zone on the smartphone
Participant monitoring their contact’s biometrics

Test Script

Task for Smartwatch:

1.Request at least two people to watch over you while you walk

2.Let your emergency contacts know that you are being followed

3.Set off sirens and automatically alert your contacts that you are being attacked

Task for Smartphone:

1.Give your contact directions to the closest safe zone

2.Check the live heart rate and movement level of your contact

3.Send a message to your contact asking if they are okay

4.Call 911 if distress siren is activated

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