Trial-Based Participation Assessment (Trial III)
The TBPA (trial III) or the participation grid is a modification of the responsibility pie (Greenberger & Padesky, 1995). Although both are very similar procedures, in my experience, the participation grid seems to allow a more progressive exposure to the avoided or shameful situation. Additionally, it can be particularly useful for the patients who do not like or feel uncomfortable when asked to draw. The TBPA usually brings a surprise element when the patients calculate the sum of all percentages given to the circumstances and people who have participated in the event, and patients become less guilty or ashamed on discovering that their own participation or responsibility is minimal or inexistent.