Purpose: This paper aims to present a model for the quality assurance of digital educational material that is appropriate for adult education. The proposed model adopts the software quality standard ISO/IEC 9126 and takes into account adult learning theories, Bloom's taxonomy of learning objectives and two instructional design models: Kolb's model (the learning cycle) and Gagne, Briggs and Wager's model. Design/methodology/approach: The structure of this paper is as follows: in the second section, the theory of "the learning cycle of Kolb" is discussed. The third section discusses the model of Gagne, Biggs & Wager. The fourth section discusses and categorizes the characteristics and sub-characteristics of the quality of digital educational material. The fifth section discusses and categorizes the quality attributes of digital educational material. Moreover, the correlation of the sub-characteristics of the material with the model of Gagne and that of Kolb are examined. Findings: The authors developed a quality model that adopts the structure of ISO/IEC 9126 standard, using basic notions of theories of adult education to define its characteristics and sub-characteristics. The model has been successfully applied in the quality evaluation of educational material distributed to distance learning adult students. Originality/value: The innovative combination of an established quality model with sound educational theories yields a comprehensive model that allows both a qualitative and quantitative evaluation of the appropriateness of digital educational material. The applicability of the model is demonstrated by applying it to specific digital materials specially developed for adult education.