When preparing charts for court testimony, what is the main purpose of these charts?

The main purpose of preparing charts for court testimony is to visually aid understanding of the testimony. Charts can effectively present complex information in a clear and organized manner, allowing jurors to grasp key points more easily. This visual representation can help illustrate relationships, patterns, or comparisons that may be difficult to convey through verbal testimony alone. By using charts, expert witnesses can enhance the juror's ability to absorb and retain information, which is especially important in cases involving technical aspects such as fingerprint analysis.

In contrast, the other options do not align with the intended use of charts in a courtroom setting. Decorating the courtroom does not enhance the jury's comprehension of the evidence. Confusing the jury undermines the purpose of clear communication, and standardizing fingerprint comparisons is a procedural aspect rather than a goal of using visual aids in court.