Identifying Requirements: Why Usability Matters
Welcome! In this guide, we are going to explore one of the most important parts of being a designer: Usability. Think about the last time you used a product that was really frustrating—maybe a website that was hard to navigate or a bottle that was impossible to open. That is a usability problem!
When we design prototypes, we aren't just making something that looks "cool." We are making something for a human being to use. If they can't use it easily, the design has failed. Let’s break down the four key things you need to know for your OCR GCSE exam.
1. Impact on a User’s Lifestyle
A good design should fit into a person's life like a missing puzzle piece. It should make their daily routine better, faster, or easier.
What to consider:
Does the product solve a real problem in their day? For example, if you are designing a coffee cup for someone who commutes by bus, it needs to be spill-proof and fit into a bag pocket. If it doesn't fit their lifestyle, they won't use it.
Example: A folding bicycle is designed specifically for the lifestyle of someone who lives in a small flat and takes the train to work. The "usability" here is about how easily it folds and how light it is to carry.
Quick Review: Usability means the product "works" for the way the user actually lives.
2. Ease of Use and Inclusivity
Ease of use is exactly what it sounds like: how simple is the product to understand? If a user has to read a 50-page manual just to turn on a toaster, the ease of use is very low!
Inclusivity means designing for everyone. This includes people with different abilities, ages, or even whether they are right or left-handed.
Key ideas for Inclusivity:
• Large buttons: Helps children or elderly people with less grip strength.
• Clear symbols: Helps people who speak different languages understand how the product works.
• Adjustability: A chair that goes up and down is more inclusive because it fits more people.
Don’t worry if this seems tricky at first! Just remember the "TV Remote" rule: If your nan can't figure out how to change the channel because there are too many tiny buttons, it isn't an inclusive design.
3. Ergonomics and Anthropometrics
These are two "big" words that often confuse students, but they are actually very simple once you know the difference!
Anthropometrics (The Measurements)
This is the study of human body measurements. Designers use data (charts and numbers) to find out the average height, arm length, or hand size of their target user.
Ergonomics (The Interaction)
This is how we use that data to make products comfortable and efficient. It’s about the "fit" between the user and the product.
Memory Trick:
• Anthropometrics = All about the numbers (measurements).
• Ergonomics = Ease of use and comfort.
Real-world example: When designing a game console controller, a designer looks at anthropometric data to see how big the average hand is. They then use ergonomics to place the buttons exactly where the thumbs naturally rest so your hands don't get tired.
Common Mistake to Avoid: Don't say "The chair is very anthropometric." That doesn't make sense! Instead, say "The designer used anthropometric data to make the chair ergonomically comfortable."
4. Aesthetic Considerations
Aesthetics is all about how a product looks, feels, and even smells or sounds. While we might think "looking good" isn't about usability, it actually is!
Why it matters:
If a product looks organized and clean, users feel more confident using it. If a button is bright red, we "know" it's for stopping or an emergency. This is called a visual cue.
What to look for:
• Color: Does it signal what the part does? (e.g., green for 'go').
• Texture: Does a handle have a "grippy" texture so we know where to grab it?
• Shape: Does the shape of the product look "inviting" or "scary"?
Did you know? High-end car companies hire "sound engineers" to make sure the car door makes a satisfying "clunk" sound when it shuts. This aesthetic choice makes the user feel like the car is safe and well-built!
Summary: The Usability Checklist
When you are writing about usability in your exam or for your prototype, ask yourself these four questions:
1. Lifestyle: Does it fit into the user's daily routine?
2. Inclusivity: Can everyone (including people with disabilities) use it?
3. Body: Did I use Anthropometric data to make it Ergonomic?
4. Look: Do the Aesthetics help the user understand how to use it?
Key Takeaway: Usability isn't just an extra feature; it is the heart of Identifying Requirements. If a product is hard to use, it doesn't matter how well it was manufactured—it won't be successful!