19 promising. Therefore, to foster the intervention development, we made use of the Intervention Mapping (IM) protocol and methods of co-creation. By using such methodological approaches, we ensured both a theoretical foundation of the intervention and tailoring of the intervention to the needs of the intended target groups. Below we describe how we did this. Figure 1.2 Framework of the project IROHLA - Intervention Research On Health Literacy among Ageing population, explaining how to intervene on health literacy problems The backbone of our intervention development was provided by the IM protocol. IM is a planning approach that is based on intervention development theory and describes an iterative process with six steps to develop interventions. When researchers go through the different steps subsequently, the IM protocol serves as blueprint to design, implement and evaluate an intervention[73]. The six steps and related tasks of the IM process are given below: 1. Conduct a needs assessment or problem analysis to identify what needs to be changed and for whom; 2. Create matrices of change objectives by combining behaviors with behavioral determinants; Community support Empowerment persons lowhealth literacy Communication clients and professionals Health literacy capacities professionals Reduction access barriers HEALTH LITERACY INTERVENTIONS HEALTHY AGING INTERMEDIATE RESULTS PROFESSIONAL Health system INDIVIDUAL Context HEALTH LITERACY OUTCOMES
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