Table 1.

Empirical data

Data types	Use in analysis
1. 10 semi-structured interviews (duration 60–90 min)	Primary data for thematic analysis
2. NEON Handbook; quality characteristics for CES	Development of the topic guide
3. Final quality assessment reports	Development of the topic guide; data triangulation
4. Minutes of the training session; interim meeting and feedback meeting	Data triangulation
5. Self-reflection reports on CES services within their own organization	Data triangulation