Sitting calmly, focused and maintaining eye contact while not moving nervously portrays assurance. Avoiding defensive activities and speaking clearly, in a straightforward manner similar to the way one would speak to acquaintances also indicates a lack of inhibition. Decorum should be maintained at all times, irrespective of abuses opposing counsel may be extending. A forthright composure is inspiring. One must at the same time ensure that the attitude portrayed is not casual or cavalier, as this might be perceived as arrogant.
Emotion is both an asset and a liability in a deposition.
While it is important to maintain as calm a demeanor as possible, one must nonetheless emote a genuineness, demonstrating a capability of feeling. Acting too rigid or rehearsed, arrogant or nonchalant is in most instances counterproductive. Attire ought to be appropriate. As a general rule, comfortable clothing that is not too formal nor too casual is the rule for depositions. A balanced, middle ground approach is generally the most appropriate level of attire.