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If you are employed by a corporation or working on your own, one thing to avoid in any and all correspondence to the "outside" world is designer-babble. Even though you might be tempted to show off your expertise, the client will see this as being unnecessarily elitist. You might enjoy the relationship with your client a bit more if you talk in layman's terms. Some terms are unavoidable (dpi, lpi, screening, in-line, etc.), but you can overcome this with an explanation for each term. Your client will appreciate the "free" education.