Defining engineering problems

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Lesson notes

What is an Engineering Problem?

An **engineering problem** is a real-world challenge that can be solved by designing a product, process, or system.
Engineers define the problem clearly before starting to design a solution.
A well-defined problem includes **criteria** (what the solution must do) and **constraints** (limits like cost, time, materials).
The engineering design process is **iterative**—steps are repeated as new information is learned.

Criteria and Constraints

**Criteria** are the desired features or performance standards the solution must meet (e.g., must hold 10 kg, must be waterproof).
**Constraints** are the limitations on the design (e.g., budget $50, must be made from recycled materials, must be completed in 2 weeks).
Both criteria and constraints come from the needs of the **end user**, **society**, and the **environment**.
For example, designing a water bottle: criteria might include capacity and durability; constraints might include cost and material safety.

The Engineering Design Process Overview

The process typically includes stages: **problem definition**, **research**, **conceptual design**, **preliminary design**, **detailed design**, **prototyping**, **testing**, and **iteration**.
**Problem definition** is one of the most important steps—it sets the direction for all later work.
**Research** involves gathering information about existing solutions, user needs, and relevant science.
The process is **iterative**; engineers often revisit earlier stages as they learn more.

Considering the End User

The **end user** is the person who will ultimately use the product or system.
Engineers must understand the user's needs, preferences, and limitations (e.g., age, ability, culture).
User feedback helps refine criteria and constraints throughout the design process.
Example: designing a playground—must be safe for children (user) and accessible for those with disabilities.

Considering Society and the Environment

**Society** considerations include how the design affects communities, jobs, and public health.
**Environmental** considerations include resource use, waste, pollution, and lifecycle impacts (manufacture, use, disposal).
Engineers aim to minimize negative impacts and promote sustainability.
Example: designing a car—must meet emissions standards (society) and use recyclable materials (environment).

Feasibility Assessment

**Feasibility** determines if a project can proceed based on technical achievability and cost constraints.
A feasibility study evaluates alternatives and identifies the best approach.
Engineers with experience and good judgment are key to accurate feasibility assessments.
If a project is not feasible, the problem must be redefined or the project abandoned.

Importance of Clear Problem Definition

A clear problem definition prevents wasted time and resources on wrong solutions.
It includes **design requirements**—functions, attributes, and specifications derived from user needs.
Requirements control the entire design process and are used to evaluate success.
Examples of requirements: hardware/software parameters, maintainability, testability.

The engineering design process is iterative, with feedback loops allowing improvements.

A design problem is defined by criteria (what it must do) and constraints (limits).

Slides

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Practice questions

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1.What is the first step in the engineering design process?
Easy
- ADefining the problem
- BBuilding a prototype
- CTesting the design
- DGenerating ideas
2.Which of the following best describes a constraint in engineering design?
Easy
- AA limitation or restriction on the design
- BA desired feature of the design
- CThe final product of the design process
- DA step in the design process
3.A team of engineers is designing a new water bottle. Which of the following is an example of a criterion?
Medium
- AThe bottle must hold at least 500 mL of water
- BThe bottle must cost less than $2 to produce
- CThe bottle must be made from recycled plastic
- DThe bottle must be completed within 3 months
4.In the engineering design process, what is the purpose of a feasibility study?
Hard
- ATo determine if the project can be done within cost and technical limits
- BTo generate multiple possible solutions
- CTo build and test a prototype
- DTo communicate the final design to stakeholders
5.Which of the following is NOT a common stage in the engineering design process?
Medium
- AMarketing and sales
- BResearch
- CConceptualization
- DDetailed design
6.The engineering design process is best described as:
Easy
- AIterative
- BLinear
- CRandom
- DOne-time
7.A design requirement that specifies the product must function in temperatures from -10°C to 50°C is an example of:
Hard
- AA specification
- BA constraint
- CA feasibility criterion
- DA market need
8.Which of the following is an example of considering the end user when defining an engineering problem?
Medium
- ADesigning a chair that is comfortable for people of different heights
- BUsing the cheapest materials available
- CCompleting the project under budget
- DUsing recycled materials to reduce environmental impact

Revision notes

## Defining Engineering Problems (NGSS MS-ETS1-1) ### Key Idea Engineers define problems by setting **criteria** (what the solution must do) and **constraints** (limits like cost, time, materials). They also consider the **end user**, **society**, and the **environment**. ### The Engineering Design Process - **Iterative**: Steps are repeated as new info emerges. - **Stages** (example model): 1. **Research** – gather info from internet, libraries, experts, reverse engineering. 2. **Conceptualization** – brainstorm ideas. 3. **Feasibility Assessment** – check if project is achievable and within cost. 4. **Design Requirements** – define functions, attributes, specifications. 5. **Preliminary & Detailed Design** – develop and refine the solution. 6. **Production Planning & Tool Design** – prepare for manufacturing. 7. **Production** – build the product. - Other models simplify to: **Problem Definition → Conceptual Design → Preliminary Design → Detailed Design → Design Communication**. ### Important Concepts - **Problem Definition**: The most critical step. It controls the entire design. - **Design Requirements**: Include hardware/software parameters, maintainability, availability, testability. - **Feasibility Study**: Evaluates if the project can proceed. Must be achievable and within budget. - **End-of-Life Considerations**: Recycling, remanufacture, disposal. ### Remember - The process is **iterative** – you may revisit steps. - Always consider **user needs**, **societal impact**, and **environmental effects**. - **Criteria** = what success looks like; **Constraints** = limits you must work within.

Engineering design process: An iterative process engineers use to create and validate designs for products, processes, and systems, including lifecycle considerations.
Criteria: The desired specifications or performance standards that a solution must meet.
Constraints: Limitations or restrictions on the design, such as cost, time, materials, or regulations.
Problem definition: The stage where design requirements are established, including functions, attributes, and specifications based on user needs.
Feasibility study: An evaluation to determine if a project is achievable and within cost constraints before proceeding to the design phase.
Iterative: A process where steps are repeated as new information becomes available, allowing for refinement.
End user: The person or group who will ultimately use the designed product or system.

Flashcards

What is the first step in the engineering design process?

Defining the problem, including establishing design requirements, criteria, and constraints.

Define 'criteria' in the context of engineering design.

Criteria are the desired specifications or requirements that a solution must meet, such as performance, size, or cost.

Define 'constraints' in engineering design.

Constraints are limitations or restrictions on the design, such as budget, materials, time, or regulations.

Why is it important to consider the end user when defining an engineering problem?

The end user's needs and preferences determine the criteria for success; ignoring them can lead to a design that is not useful or acceptable.

How does society influence the definition of an engineering problem?

Societal factors like cultural norms, laws, and ethical considerations can impose constraints or criteria on the design.

Why should environmental factors be considered when defining a problem?

Environmental impact, such as resource use, pollution, and sustainability, can be a constraint or criterion for responsible design.

What is the engineering design process?

A series of steps engineers use to create and validate designs for products, processes, or systems, often iterative.

What does 'iterative' mean in the engineering design process?

Activities and decisions are repeated as new information becomes available, refining the design over time.

List three common stages in the engineering design process.

Research, conceptualization, and design requirements (or problem definition).

What is the purpose of the research stage?

To gather information about existing solutions, costs, user needs, and relevant literature to inform the design.

What is a feasibility study?

An evaluation of whether a project is achievable and within cost constraints before proceeding to the design phase.

What are design requirements?

The functions, attributes, and specifications that control the design, determined after assessing user needs.

Give an example of a criterion for a school project to build a bridge.

The bridge must hold at least 5 kg of weight.

Give an example of a constraint for a school project to build a bridge.

The bridge can only use 20 popsicle sticks and glue.

What is reverse engineering?

Studying an existing product to understand how it works, often used in research to inform new designs.

Why is problem definition considered one of the most important elements in design?

It sets the direction and boundaries for the entire design process; a poorly defined problem leads to ineffective solutions.

What does MS-ETS1-1 standard require students to do?

Define a design problem with criteria and constraints, considering the end user, society, and the environment.

What is the difference between the engineering design process and the engineering method?

The design process is a specific sequence of stages for creating designs; the engineering method is a broader systematic approach to solving problems.

What is a feasibility report?

A document generated after a feasibility study that outlines alternatives and recommends the best scenario.

Name two sources of information engineers might use during research.

Internet and vendor catalogs (or local libraries, trade journals, experts).

What does 'end-of-life' mean in engineering design?

Consideration of what happens to a product after its useful life, such as recycling, remanufacture, or disposal.

Why might an engineer revisit the problem definition stage later in the process?

New information or testing may reveal that the original criteria or constraints need adjustment.

What is the role of 'synthesis' in the design process?

Combining ideas and components to create a potential solution (conceptualization).

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