Counsellors use a formula developed by Mehrabian and Reed (1969) for a quick assessment of how severe a client's problem might be.
This assessment involves combining three factors:
The formula calculates severity by multiplying these three components:
$Severity = Distress $\\times$ Uncontrollability $\\times$ Frequency$
This multiplicative relationship means that the overall severity score increases substantially if any one or all of the factors (Distress, Uncontrollability, Frequency) are high.