This module is about how geographers plan an enquiry and decide how far its results can be trusted. You ask a question that data can answer, choose where and when to collect it, record it clearly, work safely and with permission, and then say what the evidence does and does not show. It sits within the IGCSE Geography learning guide and supports the data skills in population and settlement evidence.
Questions on this topic often describe a plan and ask you to improve it. Marks go to specific, reasoned choices rather than general phrases such as “collect more data”.
What do you need before starting?
You need to work out a mean, a percentage and a simple interval. If you can find 30 out of 40 as a percentage and divide 600 by 12, you are ready.
What does a worked example look like?
Here is a small one that touches the whole module. A class studies the invented Sungai Lanai and wants to know whether the channel gets wider downstream.
Step 1, the question: “How does channel width change between 1 km, 3 km and 5 km downstream of the source of Sungai Lanai?” It names a place, a measurable variable and a comparison.
Step 2, the sample: three sites at fixed distances, with five width measurements at each site. That gives 3 × 5 = 15 readings.
Step 3, the record: a table with site, distance, time, unit (metres) and observer initials.
Step 4, the limit: if the class visits on one day in one season, the results show widths on that day only. A claim about all rivers would go beyond the evidence.
The same habit runs through every lesson: question, sample, record, safety, limit.
In what order should you study the lessons?
- State a geographical question that can be investigated: everything else depends on a clear question.
- Choose a sampling method for an original scenario: decides where and how often you collect data.
- Design an observation record: turns the plan into a usable sheet.
- Identify a safety and permission requirement without directing unsafe work: the planning check every real visit needs.
- Explain how sample design limits inference: the evaluation skill that closes the enquiry.
What are the common traps?
- Writing a question that asks for an opinion or is too wide to answer in a day.
- Choosing sample sites because they are easy to reach.
- Leaving out units, times or the observer on a recording sheet.
- Naming a hazard without saying what controls it.
- Claiming a result for a whole region from a few sites.
How do you use the practice set?
Work through the mixed practice once the lessons feel familiar. Cover each answer, write your plan or working on paper, then compare it step by step. Record each slip in the mistake log and retest queue and return to the matching lesson.
You can plan your own sample and graph in the fieldwork sample and graph planner. If you want a teacher to look at your written answers, see IGCSE Geography one-to-one tuition.