The suppositions of traditional queuing theory might be too prohibitive to ever be ready to display genuine circumstances precisely. The intricacy of creation lines with item explicit attributes can't be taken care of with those models. There are a few customers who leave the line feeling that they are worn out on holding up in the line. This sort of customers' conduct is called reneging. It briefly summarizes the achievements of Hungarian researchers to the Queuing Theory and the most cited result of the author is mentioned. It ends with the References of the most important sources.