It is a good idea to have a data sheet, either on paper or a spreadsheet, prepared in advance, with one row for each observational unit and one column for each measurement.
Record everything at the proper time; do not go back and make it up later. For example, if you are supposed to record temperature then do so; don't simply look back at someone else's temperature records later and copy the figure.
Do not make `neat' copies: you are likely to introduce errors.
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Page updated 17/11/01