The suggested design (Randomized Five-group Koksal’s Experimental Design) is a true
experimental model in which randomly assigned subjects to five groups are included. Random
assignment gives advantages over preventing problems regarding external validity and non-equivalent
groups in an experimental study (Currie, 2001). The design has two intervention and three control
groups and pre- and post-test applications for two times in three groups have also been inserted into
the design. As another component, video recording for three times during the intervention in two of
the groups has been anticipated. The proposed design is illustrated in figure 2