the industry has no standard measure on the quality of interactions so far. in fact there are few approaches so far:

Net Promoter Score by Fred Reicheld

sum of different actions by Eric T. Petersen

4I by Brian Haven (Forrester)

Engagement Ladder by Li/Bernoff (Forrester)

...

i'd like share and discuss thoughts on these.
are measures necessary at all? i think: yes. especially for companies who are used to measure about everything - as kind of a start into a new way of communication and cultural change.