Conducting qualitative research interviews among individuals with intellectual disabilities, including cognitive limitations and difficulties in communication, presents particular research challenges. One question is whether the difficulties that informants encounter affect interviews to such an extent that the validity of the results is weakened. This article focuses on voluntary informed consent and the specific challenges with the greatest effects on such interviews. The discussion shows that complementary and meaningful descriptions from informants imply the need to employ alternative strategies and methods that may, in other contexts, challenge the traditional understanding of what is acceptable in research.