The IL-HUMASS survey on information literacy has been designed, based on and aimed to be applied to a population of students, teachers and librarians holding various degrees in social sciences and humanities at Spanish and Portuguese universities. The case-study method, experts’ opinions, and a literature review were used to prepare an initial version that was refined through student focus groups, interviews with librarians, and academics’ reports. A final version contained 26 items grouped into four categories (information search, assessment, processing and communication/dissemination) and three self-reporting dimensions (motivation, self-efficacy and favourite source of learning). The self-reporting nature of the IL-HUMASS survey involves a self-assessment approach that has until now been proposed rarely and only in a limited way. This will enable a better understanding of user groups through a mixed analysis including two quantitative dimensions (motivation and self-efficacy) and one qualitative dimension (the preferred source of learning).