Carel Jansen participated in the European health literacy research project IROHLA (December 2012 until December 2015), resulting, among other things, in the Health Literacy Centre Europe portal, in the further development of which he is now involved.
Together with colleagues from South-Africa and the Netherlands, Carel Jansen was involved in EPIDASA and HACALARA, two research projects on HIV/AIDS Communication.
Since 2019, Carel Jansen has chaired the Project group Uitdrukkingsvaardigheid (Language and Communication Competence), consisting of experts in the field of language and communication education in Dutch universities. He then became a member of a working group formed by the Taalunie (Union for the Dutch Language) to advise the Dutch Minister of Education on ways to advance the language proficiency of Dutch students in higher education. The basis for the resulting advice was an extensive literature review of which Carel Jansen was one of the authors.
Carel Jansen actively promotes and supports the so-called Boektrommel Projek (the Book Box Project) in South Africa.