Pham, Thi HaoBeck, EkkehardPostma, Maarten JNémeth, BertalanÁgh, Tamásde Waure, ChiaraSalisbury, David MNutma, Nynkevan der Schans, Jurjen2023-01-312023-01-312023-01-093669990010.3389/fpubh.2022.1080678http://hdl.handle.net/10029/626378The tool was developed in two phases. First, a modified Delphi process was used to construct the tool. The process included a literature review, stakeholder consultations, and a three-round Delphi study. The Delphi panel included researchers, supra-national and national decision-makers of immunization programs recruited from five countries, using snowball sampling method. The consensus was predefined at the agreement rate of 70%. Pilot testing of the tool was conducted in the Netherlands, Germany, Serbia, and Hungary involving researchers in the field of health technology assessment. After assessing the countries' readiness, researchers evaluated four features, namely comprehensiveness, relevance, acceptability, and feasibility of the tool via an online survey that included 5-scale Likert questions. The percentages of affirmative answers including "agree" and "totally agree" choices were presented.enCopyright © 2023 Pham, Beck, Postma, Németh, Ágh, de Waure, Salisbury, Nutma and van der Schans.agingassessmentevidenceimmunization programsreadinesstoolArticle2296-2565Front Public Health 2023;10:1080678