Description

Pearson et al proposed the clinical algorithm structural analysis (CASA) complexity score to evaluate flow diagrams. The authors are Harvard Community Health Plan in Massachusetts and the Ben-Gurion University in Israel.


 

Elements to the CASA complexity score:

(1) number of diagnostic boxes in the entire algorithm

(2) number of non-diagnostic (state, action, other) boxes in the entire algorithm

(3) qualities of each loop

(3a) number of diagnostic boxes in the loop

(3b) number of non-diagnostic boxes in the loop

 

CASA complexity score =

= (2 * (number of diagnostic boxes)) + (number of non-diagnostic boxes) + SUM(points for each loop)

 

points for each loop =

= (2 * (number of diagnostic boxes in the loop)) + (number of non-diagnostic boxes)

 

where:

• It appears that the diagnostic box that "starts" a loop is counted twice since it also "ends" it.

 

The higher the CASA complexity score, the greater its complexity.

 


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