Generic log file represents data collected by various devices and applications used during the study. The log contains set of pairs key-value that represents custom data
collected during the study. Example of XML log file is in the Fig. 4. Typically, each record in the set contains timestamp that represents occurrence of an event or start
and finish timestamp that represent duration of an event. Optional but convenient pair is information about change of state in application model (e.g. location description
stored in each state of navigation application) that can be used for interconnection of application model and generic log