Question 1: Is the intent to use only Author Date/Time for Comfort Measures, Ordered? and ignore the Global.NormalizeInterval when the status is Ordered? For example: the only time given for Comfort Measures Performed or Ordered is an Author Date/Time. Answer 1: Since only "Intervention, Order".authorDatetime attribute can exist, the normalized relevant interval will be null and the Coalesce will return the authorDatetime. The Global.NormalizeInterval is not “ignored” but will return as null since the data attribute does not exist. Question 2: Is this outside the Global.NormalizeInterval Timing when the status is "Ordered", but Author Date/Time (as a PointInTime) is included in Global.NormalizeInterval Timing for a status of "Performed"? Answer 2: The such that Coalesce expression can return a Datetime from start of the normalized relevant interval or authorDatetime from an Intervention but only authorDatetime attribute can exist from an Order. An "Intervention, Performed" without a relevantDatetime or relevantPeriod could return authorDatetime representing the time that the action was recorded if available.