Design criteria

Design criteria are the specific standards a solution has to meet in Intro to Engineering, like strength, safety, cost, appearance, and sustainability. They turn a vague idea into measurable targets for the design process.

What are design criteria?

Design criteria are the requirements your engineering solution has to satisfy in this course. They tell you what the final product or system should do, how well it should do it, and what limits you have to work within.

In Intro to Engineering, criteria usually come from the problem statement, the user, or the class project prompt. For example, if you are designing a phone stand, your criteria might include holding a phone at a specific angle, staying stable on a desk, being made from a set of available materials, and costing less than a certain amount. Those are not random preferences. They are the standards you use to judge whether your design actually works.

Design criteria are different from ideas or sketches. A sketch shows what something might look like. Criteria tell you how to measure whether that sketch becomes a successful design. Good criteria are clear and usable, so you can compare options instead of arguing from gut feeling. That is why engineers often turn broad goals like “make it strong” into more specific targets, such as “support 2 kg without bending more than 5 mm.”

Criteria also connect directly to material selection and design considerations. If a part must be lightweight, that rules out some heavy materials right away. If it must survive repeated use, durability matters more than a cheap option that wears out fast. If it will be handled by people, safety and comfort matter too. The material is not chosen in isolation, it is chosen because it fits the criteria.

In a classroom project, you will often see criteria grouped into categories like performance, safety, aesthetics, cost-effectiveness, and sustainability. A strong design meets the needed function first, then balances the tradeoffs. That is the core engineering move, choosing among options based on evidence, not just preference.

Why design criteria matter in Intro to Engineering

Design criteria are the backbone of decision-making in Intro to Engineering because they tell you what counts as a good solution. Without criteria, a design review turns into opinions about which idea looks better or seems easier. With criteria, you can compare prototypes using the same standards.

This term also shows up any time you have to justify a material choice. If your project asks for a durable, low-cost object that can be manufactured easily, you are already making tradeoffs. A strong material might be too expensive, while a cheaper one might fail under load. Criteria help you explain why one choice fits the problem better than another.

They also connect the technical side of engineering with the human side. A design that works on paper can still fail if it is uncomfortable, ugly, hard to build, or wasteful. That is why Intro to Engineering often treats criteria as a balance of function, safety, appearance, manufacturability, and environmental impact.

When you write project reflections or design reports, criteria give your explanation structure. You can point to each requirement and show how your design met it, where it struggled, and what you would change next. That is exactly how engineers talk about success, not as “my favorite idea,” but as “the option that best met the requirements.”

How design criteria connect across the course

Performance Requirements

Performance requirements are the measurable things a design has to do, like supporting a load, moving a certain distance, or holding a temperature. They are often the most visible part of design criteria because they describe whether the product actually works. In a project, you usually turn a broad goal into specific performance targets you can test.

Aesthetic Considerations

Aesthetic considerations cover how a design looks and feels to the user. In Intro to Engineering, this is not just about style, because appearance can affect usability, market appeal, and how people interact with the product. A design can meet every technical requirement and still be a weak solution if it feels awkward or unfinished.

Cost-effectiveness

Cost-effectiveness means getting the best result for the resources you spend. Design criteria often include a budget limit, so you have to compare materials, manufacturing methods, and part count against what the project can afford. A cheaper material is not automatically better if it breaks early or creates more waste.

Design for Manufacturability (DFM)

Design for Manufacturability focuses on whether a design can actually be built with the tools, time, and process available. It connects closely to design criteria because a concept can be strong on paper but too hard to produce in a classroom or real shop setting. If a shape is too complex, DFM pushes you to simplify it.

Are design criteria on the Intro to Engineering exam?

A quiz question might give you a product scenario and ask you to identify the design criteria before choosing materials or evaluating a prototype. Your job is to separate the actual requirements from extra details, then explain how each choice meets or misses those requirements. In a design lab, you may need to justify why your group picked one material over another using evidence such as strength, cost, safety, or sustainability. If you are asked to critique a prototype, use the criteria as your checklist. Say which ones are met, which ones are only partly met, and what tradeoff shows up in the design.

Key things to remember about design criteria

• Design criteria are the specific requirements a solution has to meet in Intro to Engineering.

• They turn a broad design problem into measurable targets you can compare and test.

• Good criteria often include performance, safety, cost, aesthetics, manufacturability, and sustainability.

• Design criteria guide material selection, because the best material is the one that fits the requirements, not just the one that sounds strongest.

• In projects and labs, you use criteria to defend your design choices and evaluate whether your prototype actually works.

Frequently asked questions about design criteria

What is design criteria in Intro to Engineering?

Design criteria are the standards your engineering solution has to satisfy, such as strength, size, cost, safety, or appearance. They come from the problem you are solving and help you judge whether a design is successful. In Intro to Engineering, criteria usually show up in project prompts, design reviews, and prototype testing.

How are design criteria different from constraints?

Criteria describe what the design should achieve, while constraints are the limits you have to work within. For example, a criterion might be that a bridge model must hold a certain weight, while a constraint might be that you can only use a set amount of material or stay under a budget. Good projects usually include both.

What are examples of design criteria for a class project?

A phone stand might need to hold a device upright, not tip over, fit on a desk, and use only assigned materials. A water filter model might need to remove visible debris, allow water to flow at a reasonable rate, and be easy to assemble. The exact criteria depend on the assignment, but they should be clear enough to test.

Why do material choices depend on design criteria?

Because a material has to match the job the product needs to do. If a design needs to be lightweight, you would compare materials differently than if it needs to resist impact or heat. Criteria help you decide whether a material is a good fit for strength, cost, durability, and sustainability.