Final answer:
The best way to achieve life cycle flexibility in a project is by using a spiral design process.
Step-by-step explanation:
The best way to achieve life cycle flexibility in a project is by using a spiral design process. This process involves making changes in the design and evaluating the improved design. The advantage of using a spiral design process is that it often leads to a much better end design, while the disadvantage is that it requires time and resources for each loop. However, if planned properly, it can prevent delays and over-budget situations.