point it would be quite interesting to make a historical background. In the 1950s and early 1960s a program was considered to be satisfactory if it executed and if it was able to give an acceptable answer. We should always bear in mind that the amount of memory that was used by the computers did not give to people the opportunity to run large and complex programs. So, the key in writing a successful program had only to do with the skills of the programmer. As the years were going through, new memory technology was used which allowed larger programs to be executed. Thus, when people decided that the time has come to build complex programs only then they realise how difficult was to monitor large software projects. After this event it became quite clear that as the program size increased the probability of error increased even faster. So the problem of managing large software projects exists even in our days and we are unable to predict when it is going and if it is going to find a solution.
             Software engineering technology was born when we realised that we were not capable of managing large software projects. This situation was referred to us, as "software crisis" and it was characterised by many symptoms. The most visible symptoms of the software cr
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