Why Design Principles?
Much like the way style guides are used to govern the reputation of a company, design principles are also needed so that project goals stay consistent, though plans may change — a lot. At the beginning of any project, everyone may seem to agree. However, though they may say yes, you can be sure that each person is interpreting and inferring different things about what the project means. If only you had some design principles to help you maintain a consistent vision as the project continues to sustain focus, even after stakeholders change their mind.