Rules generate alerts or alarms based on one or more trigger criteria. They tend to follow the format of IF event(s), THEN action(s), or If This, Then That. For example, in activity monitoring, rules are used to determine when an alert should be generated based on abnormal activity within the home. For example, if the user has not got out of bed by their normal time or specifically by 10 a.m., then an alert should be raised.