Browse Prior Art Database

SKOUT: Computer-Assisted Statistical Process Control Methodology

IP.com Disclosure Number: IPCOM000116347D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 6 page(s) / 195K

Publishing Venue

IBM

Related People

Lavaud, R: AUTHOR [+2]

Abstract

Hereafter are disclosed: o a methodology to implement Statistical Process Control: SKOUT Methodology, o the Navigation that guides the user through SKOUT Methodology.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 29% of the total text.

SKOUT: Computer-Assisted Statistical Process Control Methodology

      Hereafter are disclosed:
  o  a methodology to implement Statistical Process Control: SKOUT
      Methodology,
  o  the Navigation that guides the user through SKOUT Methodology.

The following definitions apply for SKOUT Methodology:
  Process - A process consists of a system performing operations on a
   product.  Fig. 1 represents a process and related elements, which
are:
  o  input, product input is on the left side,
  o  output, product output is on the right side,
  o  one or several mechanisms to process the product,
  o  controlled parameters, parameters may be adjusted at process
      level,
  o  external parameters which are not controlled at process level,
  o  product characteristics.

Statistical Process Control (SPC) - A powerful collection of
problem-solving tools useful in achieving process stability and
improving capability through the reduction of variability.  SPC helps
to implement and control process stability and repeatability and
consequently helps to meet customer's requirements related to product
characteristics.  In order to use these tools in an appropriate
manner, a methodology is required.  This methodology guides the user
and indicates when each tool is to be used.  SKOUT Methodology aims
to guide the user implementing SPC.

SKOUT Methodology description is based on two elements:
  o  Activity - including operations to be executed by the user;
  o  Navigation - which manages activities execution and chaining.

The methodology includes a set of 17 activities.
  o  Mandatory activities which must be executed, in sequence,
      by the user.
  o  Optional activities which may be executed or not.

Activities include different steps or operations.
  o  Data or information input.
  o  Execution of a method, Ishikawa for instance.
  o  Statistical techniques executed by the system (SKOUT).
  o  Statistical methods such as Sampling Plans.
  o  Tests to verify or validate data.
  o  Expertise to manage steps execution.
  o  Expertise to guide the user and provide decision making.

Navigation provides the user with following indications.
  o  Execution status of the activity in progress.
  o  Next activity to be executed.
  o  Activities which cannot be executed.
  o  Activities which may be executed outside SKOUT Methodology.
  o  Overall activities status.

Statistical techniques or methods used in SKOUT system are well known
and implemented in packages used in the corporation; they are not
described in this document.

Activities and SKOUT Methodology - Each activity has a name and a
code, for example: Process definition (A1).

Activities are related to the process: A1,A2, A5, A6, A12, A13, A14,
A15.  Others are related to parameters or characteristics: A3, A4,
A7, A8, A9, A10, A11, A16, A17.  Data input by the user or imported
are classified as:
  o  Mandatory, these data are re...