In this piece, the focus is on axiomatic design principles, crucial for understanding complex systems. The approach involves laying out the groundwork with axiomatic design theory, emphasizing the importance of functions over physical aspects, the role of Independence and Information Axioms, and gauging uncertainty through the Information Axiom. The main aim is to introduce axiomatic design for engineered systems as a lead-up to complexity theory. Readers are directed to explore Suh's work for an in-depth dive into axiomatic design. This chapter shares similar content to a section in Suh's publication, providing a foundation for the complexity theory discussed later.