Lesson Notes By Weeks and Term v5 - Grade 8

Lesson Video

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Performance objectives

• Identify and describe the 5 stages of the design process.
• Apply the process to a simple technological problem.
• Evaluate a design's effectiveness based on set criteria.
• Generate multiple ideas and justify your chosen design.
• Communicate your design ideas clearly.

Lesson summary

This week, we delve deeper into the design process for technology projects. Understanding and mastering the design process is crucial because it’s not just about building things; it's about solving problems effectively and creatively. In South Africa, where resourcefulness and innovative solutions are vital for addressing various challenges, a strong grasp of the design process empowers you to develop practical and relevant solutions for your communities. From designing more efficient water collection systems in drought-stricken areas to creating accessible assistive technologies for people with disabilities, the design process provides a framework for innovation that can improve lives.

Lesson notes

The design process is a systematic approach to problem-solving. It involves a series of stages that guide you from identifying a problem to creating and evaluating a solution.

Let's break down each stage in detail: Investigation: This is where you define the problem and gather information.

Identify the Need or Opportunity: What problem are you trying to solve? What is the need you are addressing? This might be a problem in your community, a way to improve an existing product, or a completely new idea.

Research: Gather as much information as possible about the problem. Look at existing solutions, talk to people who are affected by the problem, and research relevant technologies and materials. In South Africa, consider traditional knowledge and resources that might offer valuable insights.

Define the Problem Clearly: State the problem in a clear, concise, and measurable way. This helps you stay focused during the design process. For example, instead of saying "The school needs more benches," a better problem statement is "The school needs three additional benches in the quadrangle that can seat at least six students each, are weather-resistant, and cost less than R500 per bench to build." Set Design Criteria: What are the requirements for a successful solution? These are the criteria you will use to evaluate your design later. Criteria could include functionality, cost, aesthetics, durability, environmental impact, and ease of use.

Design: This stage involves generating ideas and developing potential solutions.

Brainstorming: Generate as many ideas as possible, without judging them. Use techniques like mind mapping, sketching, and group discussions. Don't be afraid to think outside the box! In the South African context, consider incorporating local materials and construction techniques into your brainstorming.

Sketching and Drawing: Create visual representations of your ideas. Sketches don't need to be perfect, but they should clearly communicate your design.

Evaluate and Select Ideas: Review your ideas against your design criteria. Which ideas are most likely to be successful? Which are feasible with the available resources?

Develop a Detailed Design: Choose the best idea and develop it into a detailed design. This might involve creating a technical drawing, a model, or a prototype. Consider Materials and Construction Techniques: What materials will you use? How will you build your design? In South Africa, consider using locally sourced materials like wood, recycled plastic, or metal.

Making: This is the stage where you build your design.

Gather Materials and Tools: Make sure you have all the necessary materials and tools before you start building.

Follow Your Design: Build your design according to your detailed plan.

Work Safely: Always follow safety guidelines when using tools and equipment.

Make Adjustments as Needed: You may need to make adjustments to your design as you build it. This is a normal part of the process.

Evaluation: This stage involves testing and evaluating your design to see if it meets the design criteria.

Test Your Design: Test your design under realistic conditions.

Gather Feedback: Ask other people to use your design and provide feedback.

Analyze Results: Analyze the results of your testing and feedback. Does your design meet the design criteria?

Identify Areas for Improvement: What aspects of your design could be improved?

Communication: This is the stage where you share your design and the results of your evaluation.

Prepare a Report: Write a report that describes your design process, your design solution, and the results of your evaluation.

Create a Presentation: Prepare a presentation to share your design with others.

Share Your Design: Share your design with your community or the wider world.

Worked example

Example 1: Designing a Bird Feeder

Investigation: Birds in your area need food and water, especially during the dry season. Research different types of bird feeders and the types of birds in your area.

Design criteria: Must hold at least 500g of bird seed, be weatherproof, be easy to refill, and cost less than R50 to build using recycled materials.

Design: Sketch several designs using recycled plastic bottles and wooden skewers. Choose a design that is simple to construct and weatherproof.

Making: Cut and assemble the bird feeder using the chosen materials and tools.

Evaluation: Observe how well the bird feeder holds seed, how easily it can be refilled, and whether birds use it. Ask classmates for feedback. Identify areas for improvement (e.g., making the seed more accessible).

Communication: Write a report describing the design process, including sketches, materials used, and evaluation results.

Example 2: Designing a Hand-Washing Station

Investigation: Many communities lack access to clean water for handwashing. Research simple handwashing stations.

Design criteria: Must hold at least 5 litres of water, be easy to use (especially for children), be portable, and cost less than R100 to build using locally available materials.

Design: Sketch several designs using a bucket, a tap, and a stand. Choose a design that is stable and easy to operate.

Making: Construct the handwashing station using the chosen materials.

Evaluation: Test the handwashing station to see if it is easy to use and holds water without leaking. Gather feedback from potential users. Identify areas for improvement (e.g., adding a soap dispenser).

Communication: Create a poster illustrating the design and its benefits, and present it to the class.

Guided Practice (With Solutions)

Question 1:

You are tasked with designing a simple device to help your grandmother, who has arthritis, open jars more easily. Describe the first stage of the design process: Investigation. What information would you need to gather, and what design criteria would you set?