Buyers must clearly specify their needs before they post a project. You don't have to be a system analyst in order to do this efficiently. Write as many details as you can and give examples. Coders are not magicians. They can't guess what you want. During the development, constantly comment on the work. Always check the various steps and make sure that you are moving into the correct direction. Praise the coder if he finishes a nice tricky part of the project. Most coders are take pride in their work. Reward them if they take the extra mile for you.
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