📚 Identifying Limitations in Procedures and Suggesting Improvements | 实验步骤局限性识别与改进建议
In CIE A-Level Physics practical papers, especially Paper 3 and Paper 5, evaluation marks are awarded for identifying genuine limitations in an experimental procedure and suggesting improvements that are directly linked to those limitations. A good limitation is specific, observable and procedural, such as ‘the stopwatch was started and stopped by hand, so every measured time included a reaction-time delay of about 0.2 s.’ Vague statements like ‘the equipment was not accurate’ earn no credit.
在 CIE A-Level 物理实验卷（尤其是 Paper 3 和 Paper 5）中，评分要求学生找出实验步骤的真实局限性，并提出与这些局限性直接相关的改进。好的局限性必须具体、可观察且与步骤有关，例如 ‘秒表由手动启动和停止，因此每次测得的时间都包含约 0.2 s 的反应延迟’。像 ‘设备不够准确’ 这样笼统的说法不能得分。
1. Why Identifying Limitations Matters | 为什么识别局限性很重要
A practical improvement must be realistic in a school laboratory. It should either reduce a random error, remove a systematic error, or extend the range of data. For example, replacing a stopwatch with light gates connected
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