This paper discusses challenges in testing the reliability of qualitative research. It was found that, especially in the field of transport, it is uncommon to explicitly discuss the reliability of the analysis of interviews and literature reviews. The foundation of these analyses is the coding of interview transcriptions or the reviewed papers using content analysis. The reliability of coding can be assessed through an intercoder reliability check. This paper discusses how this assessment can be carried out. Furthermore it lists lessons learned and gives some practical recommendation based on the hands on experiences of the two authors. This paper could be relevant for all researchers that aim to conduct interviews or to write a literature review and wish to explicitly assess the reliability of their data analysis in order to enhance the research quality of their work.