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When (Condition A is met) Then (Action B is taken). The conditions referred to are subjective assessments, not data points.
If (Condition A is met) Then (Action B is taken).
Personally I think it is 17 Angels that can dance on the head of a pin
What would be wrong with an approach that said something like:
Condition 1:
When (National case incidence < 20/100,000)
And (R rate less than .4)
And (50% population have had 2nd Vacc)
And (70% population have had 1st Vacc)
Then
(Exit Lockdown)
Condition 2:
When (R rate exceeds .7 for any 5-day period)
Then
(Return to Lockdown)
Or
"The sooner you lot get yourselves vaccinated and behave yourselves with the hygiene protocols, the sooner we can come out of lockdown, and if you get complacent we'll go straight back in."