In compliance with Article 13 of Decision (EU) 2015/2240 establishing the ISA2 programme, the interim evaluation assessed the relevance, effectiveness, efficiency, EUadded value, coherence, utility and sustainability of ISA2. Based on primary data collected from 129 consulted stakeholders, extensive desk research, and expert assessments, the evaluation confirms that ISA2 performs well in all the evaluation criteria. The objectives pursued by ISA2 are still pertinent in relation to the evolving needs and problems in the field of interoperability of digital public services, and the results achieved so far are aligned with the objectives of the programme. As ISA2 progresses and solutions are further developed, the expected results should be attained, given that the implementation of the programme is continuing as planned. There are substantial synergies and limited overlaps among ISA2 actions. Moreover, particularly strong synergies exist with the Connecting Europe Facility. ISA2 contributed to enhancing cross-border interoperability and users generally tend to be satisfied with the solutions provided. Overall, ISA2 plays a crucial role in enhancing the interoperability landscape in the European Union. In light of these findings, the evaluation outlines some measures to improve the performance of ISA2 and future editions of the programme.