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All EAS documents have a tree structure in common, which reflects the hierarchical arrangement of information elements.
 Each information element belongs to one of the following types:
| Type |
Symbol |
Description |
| Header |
varies |
The top-level element of an EAS document (e.g. "Evaluation Specification", "RFP", "Evaluation Project Spreadsheet")
|
| Part |
P |
Structures a document into major segments (e.g. "Introduction", "Requirements For Business Partners", "Product Requirements").
There is no limit to the number of parts. However, a document must have at least one part.
|
| Section |
S |
An element used to structure a document.
Sections may be arbitrarily nested.
|
| Paragraph |
T |
A self-contained unit of a discourse in a written text dealing with a particular point or idea. |
| Requirement Group |
G |
A special type of Section, which contains information about Requirements.
Requirement Groups cannot be nested.
|
| Requirement |
R |
A singular documented need of what a particular product, service or methodology should be or do.
A Requirement must have a Requirement Group as its higher-ranking element.
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EAS