The comparative study also involves comparingdifferent time frames. The comparative study helpsthe researcher to ascend from the initial level ofexploratory case studies to a more advanced level ofgeneral theoretical models, invariance’s, such ascausality or evolution. The comparative study issimple designs, objects are specimens or cases whichare similar in some respects but they differ in somerespects. These differences become the focus ofexamination. The goal is to find out why the cases aredifferent to reveal the general underlying structurewhich generates or allow such a variation.