SEMI International Standards
SEMI New Activity Report Form (SNARF)



Activity Number: 4704
SNARF for: Definition of Active Time and Wait Time


Originating Global Technical Committee: Metrics
Originating Technical Committee Region: Japan
Task Force in which work is to be carried out: Cycle Time Metrics Task Force


1. Rationale: “Cycle Time” reduction has been one of the primary goals of productivity improvement activities lead by ISMI. (e.g., ISMI 300 Prime / 450 mm Industry Briefing, 06 Dec 2006).
In order to manage “Cycle Time”, it is deemed necessary to develop categorization method that can be applied to analysis of cycle time and its components..

Rate the Estimated Effect on the Industry
2: Major effect on an industry sector - identify the relevant sector

Rate the Estimated Technical Difficulty of the Activity
II: Some Difficulty - Disagreements on known requirements exist but developing consensus is possible

2. Scope:
a: Define the areas to be covered or addressed by this activity or document:

- Definition of “product cycle time”
- Definitions of “efficient time” and “inefficient time”
>This document allow the observer (of the cycle time under observation) to define “efficient time” and “inefficient
time” for the purpose of observation.

- Concept of “resource cycle time” (time components related to resource activity) and its “projection”
- Concept of “upper tier induced (inefficient time)”,“lower tier induced (inefficient time)” and “observation horizon”
- Potential: Discussion on “resource induced (inefficient time)” and its components
- Potential: Examples with particular observation point of view as RI


b: Expected result of activity
New Standard

3. Projected Timetable for Completion:
a: General Milestones
a. Activity Start: 09/11/2008b. 1st Draft by: 10/01/2009
c. Preballot by: d. Technical Ballot by: 10/04/2010
e. Committee Approval By:12/07/2011




Safety Considerations:
The resulting document is expected NOT to be a Safety Guideline


Intellectual Property Considerations:
a. In complying with the standard or safety guideline to be developed, the use of patented technology or a copyrighted item(s) is NOT required
b. The body of the standard and any appendices or related information sections will NOT include copyrighted material

Comments, Special Circumstances:
This SNARF was revised as folows;
1st Revision 2009/10/01
2nd Revision 2010/10/4


Approval: Activity approved by Committee/GCS on October 1, 2009