How does the iterative nature of AR support the success of a long-term AR project that includes many cycles?

In 500–600 words, address the following questions:

In an action research project, there may be many, many cycles of action research (AR). Why is this so?
When speaking of action research, what does the term iterative mean in practice?
How does the iterative nature of AR support the success of a long-term AR project that includes many cycles?
Why is the generation of knowledge such an important aspect of AR?

APA format, 500 words, scholarly references