... concentration Volume of ......... Volume of ....... Table to show the variables that must be controlled Variable Why it must be controlled How it will be controlled Class practicals and individual preliminary work can help you to: * identify key variables and design 'fair test' * plan a procedure which includes appropriate controls * select equipment * work out a suitable number of measurements / observations to include in plan * work out a suitable range of measurements to take. Reasons for choice of equipment can be based on the preliminary study once you have used the apparatus and seen its advantages / disadvantages. The justification of your choice can follow more easily after a thorough preliminary study. Advice on Implementation Some common errors when recording your data - 1. Not recording all the raw data 2. Constructing tables that do not include all the relevant information 3. Using two or three small tables when one table (often 'landscape') is required 4. Using a separate table for mean results when ...

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