A prior mode can be calculated by counting the number of linkages in the concept maps of boosters and barriers (a guide on how to develop concept maps is available **here**).
Once each concept map has been finalised, the number of links connecting each factor should be totalled. Then, using the same formula used to work out the Simple and Weighted BBQ prior modes, a Concept map prior mode can be established:
[math] Prior mode = left (Sum of Booster links + 0 right )+left (100 - Sum of Barrier links right ) div 2 [/math]
**NB: The booster and barrier totals from the above exercise can be added to this template in order to define the average prior mode. **