ATTACHMENT B

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SECTION A
COST STUDY -ATION
PROPRIETARY RATIONALE
SKRVICX PROVIDKR NOHE=
PORTABILITY
The Service Provider Number Portability Cost Study contains actual
unit cost information for discrete cost elements. These costs
reflect BellSouth's long run incremental cost of providing this
element on a going forward basis. Public disclosure of this
information would provide BellSouth's competitors with an
advantage. The data is valuable to competitors and potential
competitors in formulating strategic plans €or entry, pricing,
marketing and overall business strategies. This information
relates to the competitive interests of BellSouth and disclosure
would impair the competitive business of BellSouth.
Additionally, the study contains information which reflects
vendor-specific prices negotiated by BellSouth. Public disclosure.
of this information would impair BellSouth's ability to contract
for g d and/or services on favorable term.
SCIS, Switching Cost Information System, is the foundation for the
calculation of switch investments contained in the study. The
model's mathematical formulas include information which is covered
by proprietary agreements between Bellcore and the mtitch vendors.
AdditiOMlly, SCIS U8e8 Sophisticated pr0gr-q a d data
management techniques which are the intellectual property of
Bellcore.
For these reasons, the Service Provider Numbst Portability Cost
Study is considered proprietary.
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