During demonstrations print and do not abbreviate. An expert cannot connect with the jury if they can t read her writing or if they don t understand her abbreviations. Keep your language simple and recognizable. Jurors are not persuaded by what they cannot understand. Make sure the jury and judge can see your visuals.
Visual aids are useless if they can t be seen.
A wise expert witness verbalizes his concern to the judge that the jurors be able to see. When the jury hears that he is concerned, this will score points with them. The expert will also find out whether they can see. Practice with videotape. The expert should see how he looks and determine where he needs to improve.