All in Design Methods

Learn to Sketch: Shading and Shadowing Cylinders

Until recently, how to shade and shadow cylindrical objects has been a mystery to me. I had known there should be areas on the surface shaded lighter and others darker, but I didn’t quite know where those should be. Understanding the physics and practicing the sketches in a detailed way (a few times) helped me lock in the core concepts. Now I can sketch them quickly without trouble. This article shares the physics and provides a step-by-step process for skill building.

How Many Samples Do I Need? Determining Sample Size for Statistically Significant Results

Anyone who has designed anything -- whether that be a new medicine, a design method, or even a new recipe -- has faced the question: “Is this better than what I had before?” If you’re just deciding whether or not you like a new recipe, getting an answer is straightforward. If you are in an academic or industrial setting you must also answer an even more important question: “Can I prove that this is better?”

Who Is Your Customer?

The customer matters. Our job is to get the customer what they want. We must interact with, listen to, and observe the customer to identify and understand their needs. But the notion of customer is significantly more complicated and important than it seems. This article breaks down and lists out the types of customers to consider when designing any product.

Verification Versus Validation

There are two general types of tests that can be done to observe the design’s strengths and weaknesses. They are called verification tests and validation tests. The differences between these tests can be confusing because the words seem and sound similar, and because some people use them interchangeably without thinking deeply about what they mean. This article describes the difference between them.


A Good-Better-Best Framework for Design

The long term relationship between a design team and it’s client has everything to do with what the design team delivers and when. Setting clear expectations about the quality and completeness of the design work keeps both the design team and the client from changing the expectations without thoughtful discussions together. Simply articulating early in the development process, what good, better, and best solutions look like can make all the difference in what is delivered and in the long term relationship.

Design through Analogy

Metaphors, similes, parallels, allegories, symbols, and, of course, analogies are some of the tools designers, engineers, and scientists often use to communicate, discover, and develop their trade. Johannes Kepler was one of the foremost scientists to apply analogies to discover the design of our solar system. We should follow his example in our efforts.

Computer-Aided Design

When I was an engineering student I took three CAD classes, mostly because they were fun. When I was the director of engineering at ATL, CAD was at the center of all our detailed design work. It was indispensable to our engineering. When I became a professor, however, my appreciation for CAD slowly and unconsciously faded. Luckily, a new university assignment has put CAD back on my radar and my appreciation for it is greater than ever.

Getting the Most out of Digital Calipers

If your job involves product or part geometry, I believe you should own and use a pair of digital calipers. They are one of the most important measurement tools to access the details of the geometry you’re working with. Even if your job is purely theoretical, it can be helpful to simply use the calipers to visualize the size and scale of features you’re specifying or being asked to work with.