Analysis of themes in fidelity item
Themes	Number of times mentioned*		Thematic scoring explained	Facilitators (F) and barriers (B) counted*		Selection of illustrative citations
	MH (N = 21)	SH (N = 8)		MH (N = 21)	SH (N = 8)
Item 1. Caseload size
1. Number of clients per full-time equivalent	19	8	Following the anchor points for scoring of the fidelity review. Caseload per full-time equivalent ≤20: facilitator. Caseload per full-time equivalent ≥40: barrier	F: 9 B: 2	F: 8 B: 0	1. There are 20 or less clients per fulltime IPS specialist2. Based on the caseload reports provided, they support 75 IPS trajectories with two IPS specialists (1.56 full time equivalent). This comes down to a larger caseload than 41 clients/IPS specialist
2. Mixed caseload	3	1	Considered a barrier is mentioned as main reason for a low final score	F: 0 B: 3	F: 0 B: 0	Based on the total caseload of all IPS specialists in organization x, we concluded most IPS specialists work with (large) mixed caseloads
3. Proper registration time spent on IPS trajectories	2	0	Interpreted as facilitator or barrier accordingly to the assessor's interpretation	F: 0 B: 2	F: 0 B: 0	The time spent on IPS vs. other trajectories is not clearly defined and the caseload is difficult to interpret for the assessors
4. Working with waiting lists	1	0	Interpreted as facilitator or barrier accordingly to the assessor's interpretation	F: 0 B: 0	F: 0 B: 0	Advised is to make a plan for future waiting lists, as there is one already with one IPS specialist, and for others there is a risk on one
Item 2. Integration of supported employment with mental health treatment through team assignmenta
1. IPS specialist and caseload related to specific teams	21	8	Facilitator: At least 90% of the caseload of the IPS specialist belongs to one or two teams. Barrier: IPS specialist is not connected to specific teams	F: 15 B: 1	F: 0 B: 3	1. IPS specialists are connected to one or two mental health teams. 90–100% of the caseload is from these teams.2. None of the IPS specialists are structurally part of a mental health team
2. Combining functions	2	1	Not applicableb	F: 0 B: 0	F: 0 B: 0	1. The IPS specialists have often a combined function and a large caseload2. Furthermore, the IPS specialists provide all kinds of support to work as well as other activities for the clients of organization x. They have to divide their time
3. Large caseload	1	1	Not applicable	F: 0 B: 0	F: 0 B: 0	All IPS specialists are part of one location only and sometimes more than one. … Location size and teams differ largely from small (30 clients) to large (250 clients)
4. Working closely with mental health team members	2	2	Interpreted as facilitator or barrier accordingly to the assessor's interpretation	F: 0 B: 1	F: 1 B: 0	The IPS specialist discusses clients with the key social worker or behavioral expert on case level and joins team meetings where caseloads are discussed
5. Divers caseload and from different teams	5	3	Interpreted as facilitator or barrier accordingly to the assessor's interpretation	F: 0 B: 3	F: 0 B: 1	The other four IPS specialists are mainly working for two mental health treatment teams, but also have some additional IPS trajectories in other teams
6. Time restraints in providing IPS	2	1	Not applicable	F: 0 B: 0	F: 0 B: 0	A number of IPS specialists provide IPS trajectories for several teams and have limited time per team
Item 3. Integration of supported employment with mental health treatment through frequent team member contact
2. Integration at intake	2	2	Interpreted as facilitators or barrier accordingly to the assessor's interpretation	F: 1 B: 0	F: 0 B: 0	IPS specialist is not present at intakes, leading to little opportunities to influence the team and enlarge attention and enthusiasm for IPS trajectories for new clients
3. Discussing caseload on a regular base	1	0	Interpreted as facilitators or barrier accordingly to the assessor's interpretation	F: 0 B: 0	F: 0 B: 0	The total caseload is discussed on a regular base