Do not force the jury to imagine key features of nontestimonial evidence beyond what is necessary. Critically evaluate your opponent's demonstrative evidence. Evaluate your opponent's demonstrative evidence to prevent problems that arise when inaccuracies or misleading perspective or scale information is present in the evidence. Camera angles in photographs and videotapes and inappropriate measurement information in graphs can produce misleading impressions of the evidence in the minds of jurors. Use movement to facilitate understanding and interest.
Operational models increase the jurors' attention to the evidence.
In addition, operational models foster the jurors' understanding of the information presented by letting jurors see how the object works. Also, using the movement present in bump charts or flip charts facilitates understanding and interest. However, where possible, make sure that the models and charts employed cannot be used by one's opponent to illustrate unfavorable information. Allow jurors to interact with appropriate evidence . Where possible, key evidence should be passed to the jury.