11/17/2014
Constructs on Warnier-Orr Diagrams
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Constructs on Warnier-Orr Diagrams Craig Borysowich May 30, 2007 | Comments (0)
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Hierarchy on a Warnier-Orr Diagram is represented with brackets. Brackets serve two purposes. They: · enclose the members of a set of logically related items, ·
separate each hierarchical level.
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A bracket must be given a name. Each bracket in the diagram represents a breakdown of the item name at the head of the bracket. The Warnier-Orr Diagram is read from left to right and from
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top to bottom within a bracket.
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Sequence Sequence represents the ordering of items in a set by listing them one below another inside a bracket.
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The Warnier-Orr Diagram uses three parts to represent the structure of a module: · · ·
ERP, PMS, HR & Payroll
BEGIN, process steps, END.
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To represent sequence, the process steps are written at the same hierarchical level in a column one after the other and are read from top to bottom.
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Alternation The alternation construct is used to represent mutually exclusive alternatives. For example, the notation (0,1) means that the item may or may not be present.
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Discussions Research Directory The alternation construct may be used with the EXCLUSIVE OR notation, represented by a
Å, or the INCLUSIVE OR
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notation, represented by a +. If two items are separated by a
Å, i.e., are mutually exclusive, one item or the other may occur but not both. For example, the customer credit rating is either good or poor but not both.
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If two items are separated by a +, i.e., are non-exclusive, one item or the other or both items may occur. For example, the customer may have a home address or a mailing address or both a home address and a separate mailing address.
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The alternation construct is also called sequence or CASE. Repetition The repetition construct is used to show that something occurs repeatedly. The number of times an item is repeated is written in parentheses below the item name. For example, the notation (1,10) below the item Customer Record indicates that there can be from one to 10 customer records in the Customer File.
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