This paper contains the results of the process of checking the comprehensibility of a self-report questionnaire, called Self-Testing Questionnaire for Reading Difficulties in Adults (ADDA by its abbreviation in Spanish), to detect university students with reading-writing difficulties in Colombian universities. It describes the step of the selection, design, and implementation of the ADDA that was used for this pilot study, in which students from two virtual universities participated: EAN University and Santo Tomas University. The aim is to identify the potentialities of the ADDA for the detection of learning difficulties in the Colombian context. Two studies were performed to check and adapt ADDA. The first study was carried out with two professionals in languages and six expert teachers (focus group) in education, psychology, mathematics, linguistics, and technology. The second one was developed with 30 first year students from different academic programs from both universities. Results show that ADDA can be applied in the Colombian context.