📚 Case Study Practical Walkthrough | 案例分析实战演练
In WJEC GCSE Psychology, analysing and evaluating case studies forms a key part of both the research methods topic and many applied questions. This practical walkthrough will guide you through what makes a good case study, how to critique one using a structured framework and how to link your answers to ethical, practical and theoretical issues. You will also work through a classic example and a fresh scenario to sharpen your exam technique.
在 WJEC GCSE 心理学中，分析和评估案例研究是研究方法主题和应用题的重要组成部分。本实战演练将引导你了解优秀案例研究的要素，如何使用结构化框架进行批判，以及如何将你的回答与伦理、实践和理论问题联系起来。你还将通过一个经典案例和一个新情境来打磨考试技巧。
1. Understanding Case Studies | 理解案例研究法
A case study is an in-depth investigation of a single person, group or event. Unlike experiments, it does not systematically manipulate an independent variable. Instead, researchers collect detailed information using multiple methods such as interviews, naturalistic observations, diaries and psychometric tests. The approach is idiographic - it focuses on the unique characteristics of the individual rather than trying to establish universal laws.
案例研究是对单个个体、群体或事件的深入调查。与实验不同，它不系统地操纵自变量。研究者会使用访谈、自然观察、日记和心理测试等多种方法收集详细信息。这种方法是个体化的——它关注个体的独特性，而不是试图建立普遍规律。
Because case studies often explore unusual or rare phenomena, they produce rich qualitative data that can generate new hypotheses. However, the intense focus on one participant makes it difficult to generalise findings to the wider population.
由于案例研究经常探索不寻常或罕见的现象，它们能产生丰富的定性数据，从而提出新的假设。然而，对单个参与者的深度聚焦使结果难以推广到更广泛的人群。
2. Advantages of Case Studies | 案例研究的优势
One major strength is the level of detail obtained. A well-conducted case study can capture complex emotions, thought processes and behaviours that might be missed in a controlled lab experiment. This richness often helps psychologists understand the participant's experience in a way that numbers alone cannot convey.
一个主要优势是所获信息的详细程度。一项高质量的案例研究可以捕捉到复杂的情绪、思维过程和行为，这些在受控实验室实验中可能会被遗漏。这种丰富性通常有助于心理学家理解参与者的体验，而单靠数字无法传达这种体验。
Case studies are also invaluable for investigating rare conditions. For instance, when a patient presents with an unusual brain injury or phobia, the single-case approach allows researchers to collect evidence that would be impossible to gather through large-scale trials. In addition, the data can challenge existing theories and stimulate further research.
案例研究对于研究罕见病症也极为宝贵。例如，当患者出现不寻常的脑损伤或恐惧症时，单案例方法使研究者能够收集到通过大规模试验无法获取的证据。此外，这些数据可以挑战现有理论并激发进一步的研究。
3. Limitations of Case Studies | 案例研究的局限性
Despite their depth, case studies suffer from poor population validity. The findings from one individual - no matter how detailed - cannot be safely assumed to apply to others. This lack of generalisability is a common criticism in WJEC exam scenarios.
尽管案例研究有深度，但其人口效度较差。来自一个个体的发现——无论多么详细——不能贸然假定适用于其他人。这种可推广性的缺乏是 WJEC 考试情境中常见的批评。
Another weakness is researcher bias. In many case studies, the investigator builds a close relationship with the participant, which may lead to subjective interpretation of data. Furthermore, because the method relies heavily on self-report and retrospective accounts, memory distortions and social desirability bias can reduce the internal validity of the conclusions.
另一个弱点是研究者偏差。在许多案例研究中，研究者与参与者建立了密切关系，这可能导致对数据的主观解释。此外，由于该方法高度依赖自我报告和回溯叙述，记忆失真和社会期望偏差会降低结论的内部效度。
4. Ethical Issues in Case Study Research | 案例研究中的伦理问题
Case studies raise distinct ethical challenges. Informed consent must be obtained, yet when studying children or individuals with impaired capacity, genuine consent is hard to secure. In such instances, presumptive consent from a parent or guardian is required, but the child's assent and ongoing comfort must still be respected.
案例研究引发了独特的伦理挑战。必须获得知情同意，但当研究儿童或能力受损的个体时，真正的同意难以获得。在这种情况下，需要取得父母或监护人的推定同意，但仍须尊重儿童的赞同和持续的舒适感。
Anonymity and confidentiality are critical. Detailed life histories published in a case study can make the participant easily identifiable even if a pseudonym is used. Psychologists must strip identifying details or seek explicit permission for publication. Moreover, the right to withdraw can become blurred when therapeutic rapport develops; the participant may feel unable to say no to ongoing observations.
匿名和保密至关重要。案例研究中发布的详细生活史可能使参与者易被识别，即使使用了化名。心理学家必须去除身份细节或征得明确发表许可。此外，当治疗关系建立时，退出权可能变得模糊；参与者可能觉得无法拒绝持续的观察。
5. A Classic Example: The Case of Little Hans | 经典案例：小汉斯的故事
One of the most famous case studies in psychology is Freud's (1909) analysis of a five-year-old boy called 'Little Hans' (real name Herbert Graf). Hans developed a strong fear of horses, particularly that a horse might fall down or bite him. Freud never met the boy directly; instead he received regular letters from Hans's father, who was an admirer of Freud's work and reported the child's dreams and conversations.
心理学中最著名的案例研究之一是弗洛伊德（1909）对一个名为“小汉斯”（真名赫伯特·格拉夫）的五岁男孩的分析。汉斯对马产生了强烈的恐惧，尤其害怕马会倒下或咬他。弗洛伊德并未直接见过这个男孩；相反，他从汉斯的父亲那里定期收到信件，汉斯的父亲是弗洛伊德工作的仰慕者，他报告了孩子的梦和对话。
Freud interpreted the phobia using his psychodynamic theory. He suggested that Hans was experiencing the Oedipus complex - he unconsciously resented his father and feared castration, which he symbolically displaced onto horses. The case became central to Freud's theory of childhood psychosexual development.
弗洛伊德用他的精神动力学理论解释了这一恐惧症。他认为汉斯正在经历俄狄浦斯情结——他无意识地怨恨父亲并害怕阉割，这在象征意义上转移到了马身上。这个案例成为弗洛伊德儿童性心理发展理论的核心。
6. Applying the Analysis Framework | 运用分析框架
To successfully evaluate a case study in an exam, you should follow a step-by-step framework. First, identify the aim of the research and the participant(s) involved. Second, note the methods used to collect data - for Little Hans, data came from letters, father's observations and dream reports. Third, examine how the data were analysed and what conclusions were drawn.
为了在考试中成功评估案例研究，你应该遵循一个逐步框架。首先，确定研究的目的和涉及的参与者。其次，注意收集数据的方法——对于小汉斯，数据来自信件、父亲的观察和梦境报告。第三，检查数据是如何分析的以及得出了什么结论。
Next, apply critical thinking: Is the evidence credible? Could there be alternative explanations? For Hans, the attachment to his mother might simply reflect a warm parenting bond rather than a hidden sexual instinct. Also check for practical issues - the entire data set was filtered through the father, who may have unconsciously shaped the narrative to fit Freud's predictions.
接下来，运用批判性思维：证据可信吗？有没有其他解释？对于汉斯，对母亲的依恋可能仅仅反映了温暖的亲子关系，而不是隐藏的性本能。还要检查实践性问题——整个数据集都经过父亲的过滤，他可能在无意识中塑造了叙述，使之符合弗洛伊德的预测。
7. Evaluating Little Hans | 评估小汉斯研究
The Little Hans case study offers rich, qualitative insight into childhood anxiety but is weakened by serious methodological flaws. The sample size of one makes the findings non-generalisable. The data were collected second-hand by a psychoanalytically informed father, introducing massive observer bias and confirmation bias.
小汉斯案例研究提供了丰富的、定性的儿童焦虑洞见，但被严重的方法论缺陷削弱。仅有一个样本量导致研究发现不可推广。数据由一位接受精神分析理论熏陶的父亲间接收集，引入了巨大的观察者偏差和确认偏差。
Furthermore, Freud's interpretation is unfalsifiable. The Oedipus complex cannot be directly measured or disproved, which lowers the scientific status of the explanation. An alternative, more parsimonious account is that Hans developed a classically conditioned fear after seeing a horse collapse in the street. Thus, while the case is historically significant, it lacks rigour and objectivity.
此外，弗洛伊德的解释是不可证伪的。俄狄浦斯情结无法直接测量或反驳，这降低了该解释的科学地位。另一种更简洁的解释是，汉斯在看到街上马匹倒下后产生了经典条件作用式的恐惧。因此，尽管该案例具有历史意义，但它缺乏严谨性和客观性。
8. Comparisons with Other Methods | 与其他方法的比较
Why use a case study instead of a laboratory experiment or a questionnaire? Experiments allow control and replication but often strip psychology of its real-world meaning. Questionnaires can gather large amounts of data quickly but cannot capture the depth of individual experience. The case study fills this gap by providing a holistic, contextualised picture.
为什么使用案例研究而不是实验室实验或问卷？实验允许控制和重复，但往往剥离了心理学的现实意义。问卷可以快速收集大量数据，但无法捕捉个体经历的深度。案例研究填补了这一空白，提供了整体化、情境化的图景。
| Method | Key feature | When it is preferred |
| Experiment | Controls variables; establishes cause and effect | Testing a specific hypothesis with quantifiable data |
| Questionnaire | Collects self-report data from many participants | Exploring attitudes across a large, representative sample |
| Case study | In-depth, multi-method investigation of a single unit | Studying rare phenomena or generating new hypotheses |
9. Exam-Style Question Walkthrough | 考试题型演练
Imagine a scenario: A child psychologist conducts a case study on Emma, a 7-year-old girl with an intense fear of balloons. Over six months, the psychologist observes Emma at home, interviews her parents weekly and asks Emma to draw pictures of her fears.
设想一个情境：一位儿童心理学家对艾玛——一个7岁、对气球有强烈恐惧的女孩——进行了一项案例研究。在六个月内，心理学家在艾玛家中观察她，每周采访她的父母，并请艾玛画出她恐惧的图画。
Question 1: Identify one strength of using a case study in this investigation. [2 marks]
Answer: The method provides detailed, in-depth data on Emma's specific experience with balloons, which could uncover unique triggers that a standard questionnaire would miss. Such qualitative depth helps develop an individualised treatment plan.
问题1： 指出在本调查中使用案例研究的一个优势。[2分]
回答： 该方法提供了关于艾玛对气球独特经历的详细、深入数据，这可以发现标准问卷会遗漏的独特触发因素。这种定性深度有助于制定个性化的治疗方案。
Question 2: Explain one ethical issue the researcher should address. [2 marks]
Answer: Because Emma is a child, she cannot give full informed consent. The psychologist must obtain parental consent and also ensure Emma verbally assents throughout the study. Moreover, Emma's right to withdraw must be made clear in an age-appropriate way, and the psychologist should stop if Emma shows distress.
问题2： 解释研究者应解决的一个伦理问题。[2分]
回答： 因为艾玛是儿童，她无法给予完全的知情同意。心理学家必须获得父母同意，并确保在整个研究过程中艾玛口头同意。此外，必须以适合年龄的方式明确艾玛的退出权，如果艾玛表现出痛苦，心理学家应停止。
Question 3: Evaluate the reliability of the data collected in this case study. [3 marks]
Answer: The reliability of the parental interviews is questionable because parents may interpret Emma's behaviour through their own emotions, introducing bias. The drawings are highly subjective and difficult to replicate. However, using multiple sources (triangulation) slightly increases the credibility of the findings, though inter-rater reliability remains low as only one psychologist analysed the data.
问题3： 评估本案例研究中收集数据的可靠性。[3分]
回答： 父母访谈的可靠性值得怀疑，因为父母可能通过自己的情绪解读艾玛的行为，引入偏差。图画高度主观且难以复制。然而，使用多种来源（三角验证）略微提高了发现的可信度，但评分者间信度仍然较低，因为只有一位心理学家分析了数据。
10. Key Takeaways and Revision Tips | 要点总结与备考建议
Always link your answer back to the specific details of the case study in the question - generic statements about 'rich data' or 'small sample' will not earn top marks unless they are clearly applied to the scenario. Use the PEE structure (Point, Evidence, Explain) when writing longer evaluations.
始终将答案与题目中案例研究的具体细节联系起来——关于“数据丰富”或“样本小”的泛泛陈述除非清晰地应用到该情境，否则不会获得高分。在撰写较长的评价时，使用 PEE 结构（论点、证据、解释）。
Memorise a balanced evaluation: two strengths and two limitations for any case study, including one ethical point. Examples of good evidence include issues of generalisability, researcher bias, qualitative versus quantitative data, informed consent and confidentiality. Finally, remember that no method is perfect - the WJEC examiners expect you to appreciate why a psychologist might still choose a case study despite its flaws.
记住一个平衡的评价：任何案例研究都准备两个优点和两个局限，包括一个伦理要点。好的证据包括可推广性、研究者偏差、定性数据与定量数据、知情同意和保密性。最后，记住没有方法是完美的——WJEC 考官希望你能理解为什么心理学家尽管知道其缺陷，仍可能选择案例研究。
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