Following points must be kept in mind while constructing a diagram or graph. Every diagram or graph must have a serial number. It is necessary to distinguish one from the other.

1. Serial number:

Every diagram or graph must have a serial number. It is necessary to distinguish one from the other.

2. Title:

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Title must be given to every diagram or graph. From the title one can know the idea contained in it. The title should be brief and self-explanatory. It is usually placed at the top.

3. Proper size and scale:

A diagram or graph should be of normal size and drawn with proper scale. The scale in a graphs specifies the size of the unit.

4. Cleanliness:

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Diagrams must be as simple as possible. Further they must be quite neat and clean. They should also be descent to look at.

5. Index:

Every diagram or graph must be accompanied by an index. This illustrates different types of lines, shades or colors used in the diagram.

6. Footnote:

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Foot notes may be given at the bottom of a diagram if necessary. It clarifies certain points in the diagram.