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Geographical skills revision

Planning an investigation


Primary data

Unprocessed information that has not been analysed or interpreted in any
kind of way
Advantages- reliable, not biased or invalid
Disadvantages- time consuming, unreliable or invalid due to human error
whilst collecting and using poor equipment

Secondary data

Information that has…

Page 2

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Geographical skills revision

Advantages- easy to do, quick
Disadvantages- interval may coincide with in the data or location, can't
make valid statistical inferences

Pragmatic sampling

Sample where you can get access and where changes are observed such as
troughs and crests of a sand dune system.
Advantages- safe realistic


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