# Waterfall

* Traditional approach used for over 40 years.
* Requirements must be defined at the start.
* Little / no alternations.
* Sequential - Complete 1 task and then the next.
* Used in large scale SW development where thorough planning and predictability is required.

## Pros

* Extensive planning, this thoroughness often results in more accurate timelines and budgets.

## Cons

* Difficult to apply changes or modify / correct previous steps