A bit of history

The need to have a structure to develop large software systems in the 1960s and 1970s, introduced the traditional software engineering life cycle.

Those systems were mainly used to batch-processing of data in business. Consequently, the interaction human-computer was something not to worry about. In fact, they were not "user friendly" systems.

In the late 1970s, personal computing with its popularity introduced the concept of "interactivity" between users and computers, which means easier to use systems for people without software development skills.