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Informal learning is seen as the most important way to acquire and develop the skills and competencies required for work. The Dutch Defence organisation (DDO) aims to use the opportunities for development of employees that informal learning offers better and is looking for suitable interventions. Four possible interventions to improve informal learning were developed, based on factors that influence informal learning. The purpose of this paper is to assess how Dutch Military personnel rate these interventions and to gather their opinions and preferences per intervention.

A total of 96 employees completed an online mixed-method vignette study. In the questionnaire, the four interventions were introduced by a visualisation in the form of a “comic strip” (vignette), and respondents’ perceptions were measured with multiple choice and open-ended questions.

Respondents clearly indicated a preference for two of the four interventions, i.e. informal mentorship and safe learning environment. They provided numerous advantages and disadvantages per intervention. They also indicated that all four interventions could be used throughout the entire Dutch Defence Organisation.

The results contribute to a thoughtful design of interventions that can be used in practice; also, the interventions can be improved based on the advantages, disadvantages and suggestions formulated by the respondents in this vignette study.

The designs of interventions are studied in a systematic way by the target population before they are actually developed and implemented. In addition, the use of “comic strips” and visualisations in vignette studies is quite original.