📚 IGCSE CCEA Engineering: Case Study Practical Drill | IGCSE CCEA 工程：案例分析实战演练
Case study questions in CCEA IGCSE Engineering are not just memory tests – they ask you to act like a junior engineer facing an authentic design problem. This drill guides you through a repeatable method, from reading a brief to evaluating a final prototype, so you can approach any case study with confidence.
在 CCEA IGCSE 工程中，案例研究题不只是考查记忆，而是要求你像一名初级工程师那样面对真实的设计问题。本次实战演练将带你走完一套可复用的方法，从阅读任务书到评估最终原型，让你能够自信应对任何案例研究。
1. Understanding the Case Study Brief | 理解案例研究任务书
Read the brief at least twice. Highlight the design problem, the target user, the setting, the key constraints and any specified success criteria.
将任务书至少读两遍。标出设计问题、目标用户、使用场景、关键约束条件以及任何明确的成功标准。
In CCEA case studies, marks are often lost because students solve the wrong problem. Underline verbs such as ‘design’, ‘select’, ‘justify’, ‘compare’ and ‘evaluate’ so you know the command expected.
在 CCEA 案例研究中，学生常因答错问题而失分。在 ‘design’、’select’、’justify’、’compare’、’evaluate’ 等指令词下划线，明确题目要求。
Convert the brief into one clear problem statement. For example: ‘Design a low-cost device that safely lifts a 5 kg toolbox onto a workbench for a wheelchair user.’
将任务书转化为一句清晰的问题陈述。例如：”为轮椅使用者设计一种低成本装置，将 5 kg 工具箱安全地提升到工作台上。”
2. Analysing the Design Context | 分析设计背景
Sketch the context diagram before solutions. Identify where the product will be used, environmental conditions, available power, maintenance access and any safety risks.
在提出方案之前先画出情境图。明确产品使用地点、环境条件、可用动力、维护通道以及任何安全风险。
Good analysis separates ‘must-have’ requirements from ‘nice-to-have’ features. Must-have criteria include structural safety, load capacity, dimensional limits and cost ceiling.
良好的分析会把 ‘必须具备’ 的要求与 ‘最好具备’ 的功能区分开。必须具备的标准包括结构安全、承载能力、尺寸限制和成本上限。
Use a simple table to organise factors: function, user, environment, manufacture, disposal. This becomes your decision-making filter later.
用简单表格整理要素：功能、用户、环境、制造、废弃处理。这将成为你后续决策的筛选工具。
3. Identifying Stakeholders and Requirements | 识别利益相关者与需求
Stakeholders are everyone affected by the product. List end users, installers, maintenance staff, manufacturers, retailers and regulators.
利益相关者包括所有受产品影响的人。列出最终用户、安装人员、维修人员、制造商、零售商和监管机构。
Interview data may be provided in the case study. Extract each stakeholder’s needs and rank them by importance, especially safety-critical needs.
案例研究中可能提供访谈数据。提取每位利益相关者的需求并按重要性排序，尤其是安全关键需求。
Turn needs into measurable design criteria. Instead of ‘easy to use’, write ‘the user must be able to operate the lift with one hand and a force of no more than 30 N’.
把需求转化为可测量的设计标准。不要写 ‘易于使用’，而要写 ‘用户必须能单手操作升降装置，操作力不超过 30 N’。
4. Generating a Design Specification | 制定设计规格
A design specification is a numbered list of precise, testable statements. Each statement should link to the brief, a stakeholder need, or a constraint.
设计规格是一组编号的、精确且可测试的陈述。每条陈述都应与任务书、利益相关者需求或约束条件相关联。
Use the keyword ‘must’ for essential criteria and ‘should’ for desirable ones. CCEA examiners reward clear prioritisation.
基本标准使用 ‘must’，理想标准使用 ‘should’。CCEA 考官会奖励清晰的优先级划分。
Example specification: 1) Must lift 5 kg through 800 mm; 2) Must operate without external electrical supply; 3) Should be assembled in under 10 minutes.
规格示例：1) 必须将 5 kg 重物提升 800 mm；2) 必须无需外部电源即可运行；3) 应在 10 分钟内完成组装。
5. Researching Materials and Processes | 研究材料与工艺
Do not jump to one material. Compare at least three candidate materials for the main structure using properties such as density, yield strength, stiffness, corrosion resistance and cost per kg.
不要只盯着一种材料。至少比较三种主结构候选材料，考虑密度、屈服强度、刚度、耐腐蚀性和每公斤成本等性能。
Match the manufacturing process to the material and production volume. For one-off prototypes, 3D printing, laser cutting and folded sheet metal are common; for mass production, consider injection moulding, extrusion or die casting.
让制造工艺与材料和生产批量相匹配。一次性原型常用 3D 打印、激光切割和折弯钣金；大批量生产则考虑注塑、挤压或压铸。
Use a decision matrix to justify material choice. Assign weighting to each property and score each candidate from 1 to 5.
使用决策矩阵来证明材料选择的合理性。为每项性能分配权重，并给每个候选材料打 1 到 5 分。
| Criterion / 标准 | Weight / 权重 | Mild steel / 低碳钢 | Aluminium 6061 / 铝 6061 | ABS plastic / ABS 塑料 |
| Yield strength / 屈服强度 | 4 | 4 | 3 | 1 |
| Mass / 质量 | 3 | 2 | 4 | 4 |
| Cost per kg / 每公斤成本 | 3 | 4 | 2 | 3 |
6. Developing Concept Sketches | 绘制概念草图
Generate at least three distinct concept ideas. Use labelled 2D sketches and brief annotations to show mechanism, joints, materials and key dimensions.
至少提出三个不同的概念构想。使用带标注的二维草图，并简要注释机构、连接、材料和关键尺寸。
Concept sketches are not art. They are communication tools. Use thick and thin lines, arrows for motion, and section views where internal features matter.
概念草图不是艺术品，而是沟通工具。使用粗细线、运动箭头，并在内部特征重要时使用剖面图。
Avoid ‘design fixation’. If your first idea dominates, deliberately sketch one concept that uses a completely different energy source or structure, such as a scissor lift vs a screw jack vs a pulley system.
避免 ‘设计定势’。如果第一个方案占据主导，刻意绘制一个使用完全不同能源或结构的方案，例如剪式升降机、螺旋千斤顶与滑轮系统对比。
7. Evaluating Concepts Against Criteria | 按标准评估概念
Go back to the specification. Score each concept against the must-have criteria first. Any concept that fails a safety or functional requirement should be removed or redesigned.
回到设计规格。先按必须具备的标准给每个概念打分。任何在安全或功能要求上不合格的概念都应被剔除或重新设计。
Use a weighted evaluation table. Include criteria such as safety, cost, ease of manufacture, durability, user comfort and environmental impact.
使用加权评估表。纳入安全、成本、易制造性、耐用性、用户舒适度和环境影响等标准。
Justify your chosen concept with evidence, not opinion. Write: ‘Concept B scores highest because it uses fewer moving parts, which reduces failure risk and assembly time.’
用证据而非观点来证明你选择的方案。例如：”概念 B 得分最高，因为它的运动部件更少，从而降低了故障风险和装配时间。”
8. Modelling and Prototyping | 建模与原型制作
A prototype can be physical or virtual. For CCEA case studies, you often describe or model with CAD, card, foam board, 3D printing or basic workshop materials.
原型可以是实体的，也可以是虚拟的。在 CCEA 案例研究中，你通常需要用 CAD、卡纸、发泡板、3D 打印或基础车间材料来描述或制作模型。
Record dimensions, joint types, assembly steps and any modifications. Photographs and annotated screenshots strengthen your evidence.
记录尺寸、连接类型、装配步骤和任何修改。照片和带注释的截图可以增强证据。
Fail early and learn. If the first model shows excessive deflection, change the cross-section or add a support rib, then retest.
尽早失败并从中学习。如果第一个模型出现过大的挠度，就改变截面或增加加强筋，然后重新测试。
9. Testing and Data Collection | 测试与数据收集
Design tests for each critical specification. For a lifting device, measure maximum load, cycle time, stability, force input and noise level.
为每项关键规格设计测试。对于升降装置，测量最大负载、循环时间、稳定性、输入力和噪音水平。
Repeat each test at least three times. Record results in a table and calculate the mean to reduce random error.
每项测试至少重复三次。用表格记录结果并计算平均值，以减少随机误差。
Compare test data with the target values in your specification. If a result is below target, identify whether the cause is design, material, manufacturing tolerance or operator error.
将测试数据与规格中的目标值进行比较。如果结果未达标，判断原因是设计、材料、制造公差还是操作失误。
10. Communicating Engineering Decisions | 传达工程决策
Use engineering vocabulary accurately: load, stress, strain, torque, mechanical advantage, factor of safety, tolerance, efficiency and yield point.
准确使用工程术语：载荷、应力、应变、扭矩、机械效益、安全系数、公差、效率和屈服点。
Support claims with calculations. For example, velocity ratio of a pulley system is the number of supporting rope sections; efficiency is useful output energy divided by total input energy.
用计算支持论点。例如，滑轮系统的速度比是承重绳段数；效率是有用输出能量除以总输入能量。
Efficiency = (Useful output energy ÷ Total input energy) × 100%
Present your final recommendation clearly. State the chosen solution, key materials, manufacturing route, safety features and total estimated cost.
清晰给出最终建议。说明所选方案、关键材料、制造路线、安全特性和总估算成本。
11. Exam Technique for Case Study Questions | 案例研究题的答题技巧
In the exam, read the case study before the questions. Annotate the text, underline data, and sketch a simple system boundary in the margin.
考试时，先读案例研究再看题目。注释文本、圈出数据，并在页边画出简单的系统边界图。
Use the mark allocation to pace yourself. A 2-mark question may need one clear point plus justification; a 6-mark evaluation may need two options compared and a reasoned conclusion.
根据分值分配时间。2 分题可能需要一个清晰的观点加理由；6 分评估题可能需要比较两个方案并得出有依据的结论。
Use the P.E.E. structure for longer responses: Point, Evidence, Explanation. Point: choose material. Evidence: property data. Explanation: why it meets the brief.
较长回答使用 P.E.E. 结构：观点、证据、解释。观点：选择材料；证据：性能数据；解释：为什么符合任务书要求。
12. Reflection and Continuous Improvement | 反思与持续改进
After completing a practice case study, write three reflection notes: what went well, what evidence was missing, and one improvement for your next attempt.
完成一次案例研究练习后，写三条反思：哪些地方做得好、缺少哪些证据，以及下一次尝试的一项改进。
Keep a log of common mistakes, such as ignoring cost constraints, forgetting safety factors, or choosing a material without comparing alternatives.
记录常见错误，例如忽视成本约束、忘记安全系数，或未比较替代材料就做出选择。
The more case studies you dissect, the faster you will recognise command words, specification patterns and evaluation traps. Practice under timed conditions at least once per week.
拆解的案例研究越多，你就越快识别指令词、规格模式和评估陷阱。每周至少进行一次限时练习。
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