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Clear legend (or key).

Clear labelling of axes including values.

Scales selected to maximise discrimination between values.

No use of 3 dimensional graphics.

Then there are some things are are specific to the type of graph. For example, a pie or circle graph should not have more than 7 segments. The segments should not be less than 2% (around 7 degrees).

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11y ago

What else can I help you with?