1. Choose the right type of diagram or chart: There are various types of diagrams and charts available, such as bar charts, line graphs, pie charts, flowcharts, and organizational charts. Select the type that best represents the information you want to convey.

2. Simplify the data: Ensure that the information you include in the diagram or chart is clear and concise. Avoid overcrowding the diagram with excessive data points or labels, which can make it difficult to interpret.

3. Use appropriate colors and fonts: Select colors that are visually appealing and help to differentiate data points or categories. Use legible fonts that are easy to read, even from a distance.

4. Provide clear labels: Include clear labels for each data point or category in your diagram or chart. This will help the viewer understand the information being presented and make it easier to interpret.

5. Add a title and captions: Include a title that clearly indicates what the diagram or chart represents. Additionally, consider adding captions or annotations to highlight key findings or trends within the data.

6. Ensure consistency: Use consistent formatting and design elements throughout your diagrams and charts to create a cohesive visual representation. This will make it easier for viewers to compare and contrast different data points.

7. Use appropriate scales and axes: When creating graphs or charts, ensure that the scales and axes accurately represent the data being presented. This will provide an accurate and meaningful visual representation of the information.

8. Incorporate supporting text: If necessary, include supporting text alongside your diagrams or charts to provide additional context or explanation. This can help viewers understand the information more effectively.

9. Test the usability: Before finalizing your diagrams or charts, test them with a small group of individuals to ensure they are understandable and convey the intended message. Make any necessary adjustments based on feedback.

10. Integrate with the content: Use diagrams and charts strategically within your commerce materials to complement and enhance the information being presented. They should be used to clarify complex concepts, summarize data, or emphasize important points.