FOUR METHODS OF SPECIFYING

PRESCRIPTIVE TYPE

1. PROPRIETARY SPECIFICATIONS
CLOSED PROPRIETARY

OPEN PROPRIETARY
–BASE BID WITH ALTERNATES

–LIST OF APPROVED MANUFACTURERS
–BASE BID WITH APPROVED EQUAL

2. DESCRIPTIVE SPECIFICATION

PERFORMANCE TYPE
3. PERFORMANCE SPECIFICATIONS

PRESCRIPTIVE or PERFORMANCE TYPE
4. REFERENCE SPECIFICATION

 

[source: http://www.areforum.org/forums/member.php?118010-DaveW]

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