Blended learning is facilitated by the effective combination of different modes of delivery, models of teaching and styles of learning, and founded on transparent communication amongst all parties involved with a course (Heinze & Procter, 2004).
According to Hisham et al. (2006), the definition of Blended learning is varied and contrasting. Some studies (Whitelock and Jefts, 2003; Alavi and Gallupe, 2003; Arbaugh, 2005; Peterson, 2003) referred to Blended learning as the integrated combination of traditional learning with Web-based online approaches. Singh (2003) defined Blended learning as models that combine various delivery modes.
Blended learning is being used as a combination of face-to-face learning including hard copy study materials and online learning with a variety of online resources (Bawaneh, 2011).
Many works have focused on the definition of the main functions of blended learning systems and we choose here to mention the classification of (Siemens, 2004):
Different levels of permissions for users (students, teachers, tutors, administrator, visitor).
Search functions (simple search and advanced search).
Multimedia application for digital material.
Collaborative workspace.
Knowledge share and reuse.