Retrospection = false for relationships means that only the current relationship needs to be recorded. There is no need for the system to record previous relationships. A true view of history is not required. An example of this, within the Wine Club, is the relationship between a hobby and a customer. If Lucie Jones informs the club, through the periodic data update process, that her hobby has changed from, say, horse riding to choral singing, then the new hobby replaces the old hobby and all record of Lucie's old hobby is lost.
Retrospection = false for relationships means that only the current relationship needs to be recorded. There is no need for the system to record previous relationships. A true view of history is not required. An example of this, within the Wine Club, is the relationship between a hobby and a customer. If Lucie Jones informs the club, through the periodic data update process, that her hobby has changed from, say, horse riding to choral singing, then the new hobby replaces the old hobby and all record of Lucie's old hobby is lost.