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--- userzone:userdoc:dates [2014/03/06 18:07]
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-A track defines a sequence of surveys and calculates the period when a certain survey should be answered by or for a certain patient.
-These calculations use dates from multiple sources:
- - an answer from a survey
- - an appointment linked to the track
- - another round in the track
- - from the track itself
- - manual input
-Using the **Next Step engine** you can only use the previous round in the track and answers from that previous round. This speeds up track editing and track calculation and simplifies the structure.
-More complex dependencies are possible using the **Previous Step engine***, where you can use a date from any of the previous rounds for the valid from date and any of the rounds - either later or earlier - for the valid until date. As this is a more complex version of the Next Step engine you can always upgrade to the Previous Step engine, but nor revert back from it.
-In both engines the valid from date of the first round cannot be dependent on a previous round, so the date should either be calculated from an appointment or from a track level date.
-==== An answer from a survey ====
-Every survey has a completion date that can
-==== An appointment linked to the track ====
-==== Another round in the track ====
-==== From the track itself ====
-==== Manual input ====

GemsTracker