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The second most important part of timer creation is the inviting of other users to your timer. Users in our paper prototype were unaware of how to invite multiple users to a timer, so we attempted to make it abundantly clear in our first implementation by using a multi select check box. Unfortunately a array of checkboxes is not very user friendly on mobile, so instead we implemented a multi-select using text input. See Figure 3 below.

Figure 3: The text input for sharing a timer with contacts.

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Our users were not enthusiastic about a difficult login and sign in experience, so we kept these pages very simple, as illustrated in Figure 4 below.

Implementation

The TeamTimer application consists of an html5 client written using jade, coffee-script and less that communicates with an API server written in python with flask that exposes a mongodb database. The modular separation of the client and server allowed us too quickly mock and test the front-end design with our test users before investing the time to developing the backend.

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