Closing the loop · The individual response · Element
The timing
How quickly they hear back.
The part
What it is
Within days rather than weeks. A reply arriving a month later has lost most of its effect and some of its credibility.
An immediate acknowledgement followed by a substantive reply later works well and is easy to automate in part.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.