The final prototype consists of three sub-prototypes;
a phone application, a watch application, and a model of the watch.
The phone application is based on the iPhone agenda app. The first page is split in two. The top half shows a calendar overview of the month and indicates whether or not there is an appointment for each day with a small dot under the date. The bottom half shows information for the appointments of the selected day including its name, time and location. On the top right are three buttons with which you can change the view, search for an appointment, and pair the phone with the watch. The button to add a new activity for the selected day is made larger and placed along the bottom.
When the ‘new activity’ button is pressed you move to a new page where you can input information about the appointment you want to make. You can first input the appointment's name, location, and transport method. You can either select from a list of favourite locations or add a new location for the location. Next, you can choose whether the appointment lasts the whole day or you could set a start and end time and you can choose whether or not to repeat the appointment. Afterwards, you can see the calculated travel time which takes the location and travel method into account, and a suggested leaving time which can be edited if needed. Finally, any additional notes can be added and then the appointment can be added, or cancelled if so wished.
This interface was made taking the usability heuristics into account. For instance, it uses recognition rather than recall by using the familiar interface of the apple agenda app and by making functions intuitive. This minimizes the user’s memory load and is especially important when designing for this project’s co-designer. Ideally, the interface should be so intuitive that he would not have to remember anything.
The watch application consists of one main page and two sub-pages. The main page shows the name and time of the next appointment in the centre. Around that is a blue dot that gives a visual indication of the time of the next appointment, and a white circle that acts as the hour hand of an analogue watch and rotates around the appointment. As the white circle approaches the blue dot, this gives an indication of home soon the appointment is and behaves as a countdown. Once the circle and dot meet, the dot expands and turns into one of the subpages, showing only the name and time of the appointment. Simultaneously, the watch would make a beeping sound and start to vibrate to get the attention of the participant. After five minutes the screen will return to the main page and show the next appointment. Along the top of this main screen is also a battery level indicator and a button that leads to the pairing sub-page where the watch can be paired with the phone. This would desirably only be used when setting up the device but may scarcely be used to repair the watch if it somehow gets unpaired.
This interface again applies usability heuristics. It tries to minimise the number of elements and features present. Furthermore, it makes elements intuitive, for example, if you see the white circle rotating around it
The final watch design consists of a black watch face, a soft dark brown leather wristband (Fisher, 2017), and a black pin buckle. The watch resembles a sports watch with the frame being a rounded square and relatively thick. The screen sits sunken beneath the frame to protect it from falls. Furthermore, the watch would have a touch screen, a speaker, a rechargeable lithium-ion battery, and a vibration motor.
To minimize the user's memory load, it would be ideal for the user to have to charge the watch as infrequently and as easily as possible. Therefore a rechargeable lithium-ion battery was chosen as it has numerous advantages over a coin battery such as less waste, greater capacity, rechargeability, etc. To remind the participant to charge their watch, they could choose to receive notifications about it when charging their phone. This may not be necessary however if it is intuitive enough to charge the watch at the same time as charging that phone.