From: Mark Warren
Sent: Wednesday, September 22, 2004
Subject: [leansig] RE: Value added vs Non-value added
Shiv,
Apologies for the delayed response. The best and simplest way to divide VA/NVA is based
upon the Gilbert’s development of Therbligs. You will find background information in
most any IE textbook. I have used this chart as a guide on designating VA/NVA to tasks.
These descriptions also work in the office and service environment.
Value
Added (VA) |
Non-Value
Added (NVA) |
|
|
| Assemble – only if this detail is NOT
disassembled in a later step before delivery to the customer. |
Assemble – if this detail is a temporary step,
which is later disassembled for further processing. |
|
|
| Disassemble – only if this operation is extracting
products from a naturally occurring item. Example: Butcher ‘disassembles’ the
animal carcass into products desired by customers. |
Disassemble –ask why the materials were assembled
in the first place. |
| Grasp or Release – also includes positioning,
pre-positioning, re-positioning and holding.
Transport: Loaded or
Unloaded – also
includes walk, carry, move, travel, and lift.
Search or Find includes looking for instructions,
information, parts, tools, etc.
Data Related this includes counting, recounting,
weighing, measuring, recording or logging information.
Decision includes select, inspect, sort, plan,
schedule, requisition and order.
Miscellaneous Handling includes wrapping or unwrapping, packing or
unpacking, storing or removing from storage, filing or removing from file, stacking or
unstacking, preserving and cleaning.
Delays are classified as avoidable, unavoidable or
resting. This is usually found in descriptions of waiting on machine, material or people.
|
|
| Use – a positive activity to modify a
product during this operation. (*NVA if this does not modify product for future customer
use.) |
Non-Value
Added —Required (NVA-R) |
|
| Identification – can consist of anything from labels
on packing materials, to marking at the component level. While this insures smooth flow of
the product, and provides positive identification, it does not add functional value to the
customer. |
|
| Legal requirements –data collections required for
safety-related features, but can include process audits, check sheets, recording lot
information for traceability, etc. |
Copyright
© 2003 - Tesla2,
Inc. |
MARK WARREN,
Tesla2, Inc., www.Tesla2.com
"Discovering Solutions with People" |
