To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
On this book it is very clear what are the phases of a project management (planing, building up, implementation and close out). And I acknowledged that the first step to do is to define the real problem, the who will be involved and what this project or solution will achieve.