Research on blended learning theory and practice is growing nowadays with a focus on the development, evaluation, and quality assurance of case studies. However, the enhancement of blended learning existing models, the specification of their online parts, and the quality assurance related specifically to them have not received enough attention. This paper presents in detail an enhancement, implementation, and evaluation of a rotational blended learning model. This model was adopted by the UNISCO Avicenna Virtual University. Also, its impact on some quality assurance criteria of the rotational blended learning model was presented. This research is unique in the sense that it specifies clearly the online part of the rotational blended learning model with its impact on the main quality assurance criteria.