2. Make the most of observation

2.1 Obtain factual data during experimentation

In situ experimentation is important because it will reveal the gap between what the customer says he does and what he actually does. This data, along with more subjective observations, is an integral part of your design process.

Some suggestions for data to be acquired during experimentation :

• Track function usage rates: draw up an exhaustive list of the functions provided by the product you wish to monitor. On this list, you'll track frequency of use and duration, for example. Follow the evolution of these indicators over time. During the test, you can also observe the use of an equivalent product from another brand (hidden) or range and compare. This approach...