Event Logs – slide 5

And this trace can contain a lot of different attributes. For instance, of course, the card number, but also that it is a prepaid card. For this card, as I said, several events are recorded. And as I’ve shown you before, for instance, when did you buy the card, and when did your check in on the bus or the subway or the train or whatever. And so you form a whole trace or sequence of events and observed activities for this card, not only on a single day but throughout the year, for instance. And you can imagine that you have similar traces for other cards. For instance, this card is a business type card, and not a prepaid card. So you get many different sequences of different activities being recorded. And this all together constitutes an event log.