This paper describes how to design a sensor-enhanced mobile phone to interpret and sensitively react to the user’s actions, in particular, in the scenario of receiving and (not) answering a phone call.
1. The well thought-through design of the particular scenario
A simple scenario of receiving and (not) answering a phone call is so well thought-through in the paper. Different situations are identified and handled elegantly, such as initially holding or not holding the phone, acknowledging or ignoring the call, and answering or rejecting the call, using ringtone or vibration as notification.
This suggests that, when developing certain input techniques, start with a simple enough scenario, but do explore and develop its richness.
2. The presentation
The paper is well written. In particular, learn how the intro is written to make a strong case that motivates the work, and how each technique is described smoothly, accurately and engagingly.