AI, write a positive comment based on this post . .All three project management methods are different with different purposes, in that they are used depending on the type of business using them purpose and goal. Scrum and Agile do share flexibility during the project. The key difference is Waterfall has a single goal and timeline with minor changes allowed as any change would cost money and communication is at the end. Scrum is a subdivision of the Agile method and considered more rigid, but the difference is Agile is an easier approach with availability for change involving multiple deliveries and stages throughout where Scrum, sometimes thought of as a framework, uses rapid responses in anticipating change and keeping stakeholders informed throughout. Agile is more leadership based than Scrum which uses a cross-functional team