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Have you ever wanted to share your knowledge to someone else, who havent got the process well enough ? Have you ever trying to make you solution plain to your colleges ?
If he or she are close to you, in the same room, the best way is to use paper and draw diagram in pencil. But if someone are far from you and only communication channel available, the only way is e-mail your drawings and comments.
Long ago, standard UML was put out as a graphical representation of a system's model.