Help writing a computed expression in a "logical" field to evaluate trace conditions

[byoung]

How would you write a computed expression in logical field "xyz" of Requirements Type, that evaluates the traces in the Mitigates field, and returns a count of Mitigates traces that are flagged as true in the Mitigates > "Essential" field?

[LLawton]

It sounds like you want the count of traces (therefore an integer), so what do you mean by a "logical" field? That, presumably would be a boolean.

Also, what so you mean by "flagged as true", are you using relationship flags for that?

Can you clarify?