1. Introduction

(1) Work Type 1

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   |Creation |------------------->| Reviewed |
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Created documents are interchanged and reviewed on a display or printed paper. Recipients make sometimes an editing.

(2) Work Type 2

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   |Creation |------------------->|Processed|
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Created documents are interchanged and processed without review (e.g., in CAD systems).

(3) Work Type 3

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   |Creation |------------------->|Processed and Reviewed|
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Created documents are interchanged, processed and reviewed. Processings are conversion, data merging, linking with database, etc.