1. have a clear purpose. That is, obviously, needs to offer anything without requiring the recipient to ask you if you would like to consider what.2. have the appropriate presentation format. That is to say, the compact sorting. no language easy to understand. Use tables, charts, diagrams, allowing convenient data considerations.3. the material good. That is, reliability, precision, completeness, accurate and complete. Meets requirements There is information that is current, up to date and content enough to consider.4. There is a good deal that is the most reasonable offer-Nguyen TU result. There are comparative considerations. The obvious alternatives. Clear operating guidelines
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