Application of Agile methodologies for software development

In this work explored evolution of software lifecycle models firstly to lightweight and then to agile software development methodologies, and factors that have led to a search for ways to improve approaches to software development. Also compared "outdated" development designing approaches with modern flexible and made conclusions whether the advantage of the latter over the firsts is absolute and whether or not they and only they should be used in practice or maybe older approaches still have their advantages and it is too early to exclude them.