However, each case study requires the formulation of clear questions, great command of the language and abundant knowledge of the existing literature on the subject (Scapens , 2004). This poses a threat to some researchers who think the case study method is simpler. However, this rigorous process is balanced by the innovative and highly practical results obtained through case studies (Rowley, 2002; and Scapens, 2004). Another disadvantage explained by Rowley (2002) is the lack of control over variables in relation to an experiment. Finally, Rowley (2002) states that by using the case study approach, the researcher's ability to investigate certain phenomena in their context increases; and that this method avoids the need for laboratory replication