Requirements Engineering is the initial stage in the software development life cycle, whose final product is the precise, complete, formal document about the users 'needs.

The same we applied on the interior wall behind the bar, rise from a flat metal wall, bloom, and then return to its initial stage, like the breathing of a vivid life.

Preschool education is regarded as the important component of the basic education and the even more important initial stage of life-long education.