I. Introduction
Agile methodology is currently the most popular iterative software development method [1] in practice. This methodology has shown up the most feasible for software development purposes over the last few years, both from the customer's point of view and from the supplier's point of view. This is confirmed by companies around our university, as well as recommendations by international software giants [2], universities [3], [4] and many researchers in the world. Faster software development, bigger business value and lower development costs, i.e. higher yield, are the reasons why companies look for experienced developers who are experienced in SCRUM methodology and are able to use them in practice.