Identifying the level of agile in software development projects and what will be the effect?

We live in a society that is and will be a more and more digital environment, both private and work related. Most of the products we use contain software or we use a software system. It is a discussion for several years now how the software development process should be controlled to deliver the software faster, better and cheaper. The most common way to deliver software is via the waterfall method. This way of working means decide early and deliver slowly. This approach of working has been changed into a more adaptive way, this means decide late and deliver fast. This last method is called: Agile. The purpose of this study is to investigate the effects if a higher level of agile will increase the quality of a software development projects.