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Document SEMI E124 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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SEMI E124 Document Information:
Title
GUIDE FOR DEFINITION AND CALCULATION OF OVERALL FACTORY EFFICIENCY (OFE) AND OTHER ASSOCIATED FACTORY-LEVEL PRODUCTIVITY METRICS
Semiconductor Equipment and Materials International
Publication Date:
Nov 1, 2007
Scope:
To evaluate the overall effectiveness of a factory, there are at
least three things in need of measurement: production, utilization
of assets, and costs. This guide focuses on evaluating production.
Utilization of assets and costs (as well as other economic factors)
are outside its scope.
NOTE 1: See ΒΆ R3-1.1 in Related Information 3 for a discussion
of metrics in other areas.
This guide describes metrics for an entire integrated production
line (so, for example, lots may not leave and then return to the
production line). Multiple production lines in the same factory may
be evaluated separately if they do not share resources (such as
material handling or production equipment).
NOTICE: This standard does not purport to
address safety issues, if any, associated with its use. It is the
responsibility of the users of this standard to establish
appropriate safety and health practices and determine the
applicability of regulatory or other limitations prior to use.
Purpose
This guide describes metrics that show how well a factory is
operating compared to how well it could be operating (for the given
product mix). These metrics can be used for tracking factory
performance (in value-added production) in a way that rewards good
operational decisions and that is not easy to adversely manipulate.
The metrics can be used in a process of ongoing improvement that
can be visible to all levels of a semiconductor manufacturing
organization.
The metrics in this guide are intended for evaluating the
relative efficiency of factory production after the factory is in
production, not for capacity analysis while the factory is being
designed or redesigned. However, some of these metrics can be used
in factory simulations for choosing equipment sets and scheduling
policies.
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