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Eduqas GCSE Geography B · C112
Eduqas C112 · Table A Fieldwork Methodologies Check the specification (PDF) (opens in a new tab)
Apply transect methodologies to assess variables such as environmental quality, micro-climates, river flow patterns, vegetation distribution, or beach sediment sorting.
Analyze change over time by comparing primary fieldwork data with secondary sources to investigate shifting land uses, weather, or physical landforms.
Conduct qualitative surveys to evaluate public perception of distinct landscapes, environmental quality, hazard risks, or specific honeypot sites.
Measure and analyze geographical flows, such as soil infiltration rates, pedestrian movements, river discharge rates, or longshore drift.
A high street can gain new cafés, a river bank can retreat, and temperature can rise and fall during a day. Change over time means investigating how a geographical feature or variable differs between two or more times. The timescale should suit the question: hours may reveal changing weather, while years may reveal changing retailing or land use.
The essential comparison is between evidence from an earlier time and evidence from a later time. Primary data is evidence you collect first-hand for your enquiry, such as a land use survey or temperature readings. Secondary data is evidence already collected by someone else, such as old photographs, weather-station records or previous students’ fieldwork results. Data collected first-hand by a previous school group becomes secondary data when you use it for your own investigation.
Combining the two allows you to investigate changes that began before your fieldwork visit. However, a difference between two sets of results might reflect different methods or locations rather than genuine change. Planning a fair comparison is therefore central to the enquiry.
A useful question identifies what will change, where it will be investigated and the period being compared. For example: ‘How has the proportion of vacant premises on this section of the high street changed since 2012?’ This is more manageable than asking how an entire town has changed.
Before collecting current data, examine the historical evidence. Check its date, location, coverage and method. An old photograph might show only one side of a street; a previous survey might cover a longer section. Choose a study area that can be compared at both times, and record any unavoidable differences.
Prepare a recording sheet with a location identifier, the earlier and later dates, comparable observations and a space for uncertainty. Keep the same categories and units throughout. If the old evidence does not reveal a building’s use, record it as unknown rather than guessing.
Land use is the purpose for which land or buildings are used. A high-street survey might distinguish shops, cafés and restaurants, offices, housing and vacant premises. To investigate retailing more closely, record the business name, type of business and whether it is an independent business or part of a chain.
Historical photographs and dated Google Street View images can provide the earlier evidence. Your own observations, photographs and land use map provide current primary data. Match premises using addresses and recognisable building features, not business names alone: a business may have moved or changed its name.
Suppose you compare three premises at two dates:
| Premises | Earlier use | Later use | Interpretation |
|---|---|---|---|
| A | Clothes shop | Café | Land use category changed |
| B | Food shop | Different food shop | Business changed, but category stayed the same |
| C | Vacant | Estate agent | Vacant premises returned to use |
This distinction matters. Counting every new business name as a land use change would exaggerate the change in the street’s functions. Recording both names and categories lets you answer different questions accurately.
A Cardiff investigation used photographs taken in 2012 to compare businesses with those occupying the same premises later. Those photographs were taken opportunistically: the photographer selected businesses that seemed interesting. This provided useful historical evidence, but it could under-represent less noticeable premises. A conclusion about the photographed businesses would therefore be stronger than a conclusion about the whole city.
Where practical, survey every premise in a clearly defined section. Otherwise, use a planned sample and apply it consistently at both dates. Work in supervised groups, stay on pavements, use safe crossings and avoid obstructing entrances or photographing people unnecessarily. The survey is complete when all selected premises have a matched record or a clearly recorded reason why comparison was impossible.
Calculate totals for each category, then use proportions to compare their importance:
For example, suppose 6 of 30 premises were vacant at the earlier date and 9 of the same 30 were vacant later. Vacancy rose from 20% to 30%: an increase of 10 percentage points. The number of vacant premises increased by three. These figures support a precise conclusion about this surveyed section, not necessarily the whole town.
A grouped bar chart can compare the number or percentage of premises in each category at both dates. Paired land use maps show where changes occurred. Repeat photographs can be annotated to identify visible changes, such as a shop becoming a café or a building being redeveloped. Use a similar viewpoint and include unchanged features to help locate the comparison.
Describe the overall pattern, support it with evidence and identify exceptions. Then consider possible explanations. A redevelopment or new shopping centre might help explain retail change, but a before-and-after comparison alone does not prove that it caused every closure or opening.
Weather enquiries apply the same principle to repeated measurements. You might investigate how temperature changes during a day, or compare your rainfall measurements with earlier records from a nearby weather station.
Record the location, date, time, variable and unit. A thermometer measures temperature in °C, a rain gauge measures rainfall in mm, and a barometer measures air pressure in hPa. Use consistent equipment placement and observation times. For rainfall, compare totals covering the same length of time; an hourly total and a daily total are not directly equivalent.
A line graph with time on the horizontal axis and the weather variable on the vertical axis shows the sequence of change. Look for rises, falls, peaks and unusual readings. The temperature range is the highest reading minus the lowest reading. A nearby station provides useful secondary evidence, but differences in altitude, shelter or surrounding buildings may explain differences from your measurements.
Collect data only in safe conditions. Do not go outdoors during dangerous storms to obtain readings. Stop at the planned endpoint and check that the required times have been recorded; a single day cannot establish a long-term climate trend.
To investigate landform change, compare the same feature at different dates. Historical photographs, maps and previous surveys can be combined with current photographs, field sketches or measurements. Questions might concern whether a river bank has retreated or whether a beach profile has changed.
For repeat photographs, locate stable landmarks, match the viewpoint and record the date. For repeated measurements, use the same reference points and method. A beach-profile comparison is stronger when surveys follow the same line and use comparable tidal conditions. Different water levels can otherwise make the beach appear wider or narrower without demonstrating sediment change.
Look for evidence such as a changed bank position, altered channel shape or a different beach profile. Two photographs can show a visible difference, but may not establish its exact size or when it happened. Repeated observations across several dates give a clearer picture than a single pair.
Follow the fieldwork risk assessment: avoid unstable banks and cliffs, check tides and weather, and do not enter deep or fast-flowing water. Finish when the planned safe observations are recorded, not when a preferred pattern appears.
Return to the original question and state what the matched evidence demonstrates. Then judge how confidently the findings can be applied beyond the sampled places and dates.
Historical evidence is valuable because it makes a past comparison possible, but its original purpose and sampling may limit coverage. Current fieldwork gives you control over recording, but cannot repair missing historical information. Improve the enquiry by matching methods more closely, increasing comparable coverage or adding further dates. A good conclusion recognises both the evidence for change and the limits of that evidence.
Explain how you made the comparison fair: name the matched locations, dates, categories, units or measurement methods.
Support a conclusion with figures or specific recorded changes, rather than simply saying that an area has changed.
Distinguish percentage change from percentage-point change. A rise from 20% to 30% is 10 percentage points.
Link each limitation to its effect on the conclusion, then suggest a specific improvement.
Comparing upstream and downstream sites investigates spatial variation; comparing the same sites on different dates investigates change over time.
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Last updated
Change over time
An investigation of how a geographical feature or variable differs between two or more times.
Primary data
Evidence collected first-hand by the investigator for their own enquiry, such as measurements, observations or photographs.
Secondary data
Evidence already collected by someone else, such as historical photographs, weather records or previous students’ fieldwork results.
Land use
The use of land or buildings for a particular purpose, such as housing, retailing, offices or recreation.
Sampling strategy
A plan for deciding where, when and how much data to collect.
Opportunistic sampling
Selecting observations because they are readily available or convenient, rather than using a planned representative selection.
Repeat photograph
A photograph taken again at the same location, with a similar viewpoint, to allow comparison with an earlier image.
Validity
The extent to which an investigation measures what it intends to measure and supports an appropriate conclusion.
Reliability
The consistency of results when observations or measurements are repeated under comparable conditions.
Put your knowledge into practice — try past paper questions for Geography B
Change over time
An investigation of how a geographical feature or variable differs between two or more times.
Primary data
Evidence collected first-hand by the investigator for their own enquiry, such as measurements, observations or photographs.
Secondary data
Evidence already collected by someone else, such as historical photographs, weather records or previous students’ fieldwork results.
Land use
The use of land or buildings for a particular purpose, such as housing, retailing, offices or recreation.
Sampling strategy
A plan for deciding where, when and how much data to collect.
Opportunistic sampling
Selecting observations because they are readily available or convenient, rather than using a planned representative selection.
Repeat photograph
A photograph taken again at the same location, with a similar viewpoint, to allow comparison with an earlier image.
Validity
The extent to which an investigation measures what it intends to measure and supports an appropriate conclusion.
Reliability
The consistency of results when observations or measurements are repeated under comparable conditions.
Use grouped bars for categories, lines for weather through time, and paired maps or annotated photographs for spatial changes.
Answer the question with evidence. Assess historical coverage, sampling bias, comparability and the number of dates. Differences demonstrate change only when alternative methodological explanations have been considered; change alone does not prove its cause.