Table 2 Overview of focus group topics and questions. Source: [26]

i. Start and development of the co-operation

(±10 min discussion)

“How did the co-operation/project start?”

“How did it develop to where it is now?”

“What contributed to the co-operation process?”

ii. Core (success) factors of the co-operation

(±15 min discussion)

“What are the core factors that made this co-operation happen, that energised and inspired co-operation?”

“Describe a peak experience in (intersectoral) co-operation in [case study X], when you felt really engaged and motivated”

iii. Core barriers, challenges, missing in the co-operation

(±15 min discussion)

“How could the co-operation have been?”

“What would you change if you could change anything in this co-operation? What could it still become?”

iv. Future of the co-operation

(±15 min discussion)

“Where do you want to be between now and a certain period, what does this future look like? If your dream is X, what would you want to have accomplished in Y years?”

“What are possible options (actions, projects) to reach this and enhance co-operation in the future?”

Wrap up, summary by moderator

(±5 min)

“Of all things discussed, what was the most important to you regarding intersectoral co-operation?”