Figure 3
The flowchart outlines the development process of the sexual health intervention Vastuullisex. The process begins with a literature review, which includes scientific literature, reports, statistics, scoping review, and basic education curricula. Next, co-creation involves workshops with 13-14 year olds (n = 32), interviews of health education teachers (n = 2), and panel discussions with other sexual education professionals (n = 6). Guiding theory incorporates social marketing principles and the health belief model. Other considerations include available resources. These steps lead to a needs assessment, which then informs the design of the intervention components and delivery methods.The development of the intervention