NZQA registered unit standard
8089 version 7
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Title
Use statistical process control tools for the control and improvement
of processes
Level
4
Credits
6
Purpose
People credited with this unit standard are able to: explain the
purpose and uses of statistical process control; apply statistical
process control tools to workplace situations; and interpret the
results of statistical process control and take action.
Classification
Business Operations and Development > Quality Management
Available grade
Achieved
Explanatory notes
1
This unit standard covers both process capability tools and process control charts as
follows:
process capability tools – capability ratios, CPK, CP, Six Sigma;
process control charts – X bar and R charts, X charts, P charts, C charts, CUSUMs.
2
The credit value for this unit standard has been calculated on the basis that people
seeking credit have acquired competence in the relevant statistical analysis skills.
3
Assessment evidence for this unit standard must be collected from practical
workplace experience related to quality improvement.
Outcomes and evidence requirements
Outcome 1
Explain the purpose and uses of statistical process control.
Evidence requirements
1.1
Explanation matches the statistical process control tools with the requirements
of the situation and the type of data required.
Range
data – variable, attributes, fixed and variable sample size.
1.2
Explanation of the distinction between product specifications and process limits
establishes the valid uses of the tools.
1.3
Explanation of how and when a process control study should be set up
establishes the significance of previous process capability analysis.
NZQA National Qualifications Services
SSB Code 130301
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.4
8089 version 7
Page 2 of 3
Explanation of patterns of variability, measures of central tendency and spread,
and variability and causes of variation establishes their significance for and
applications in process control.
Range
variation – common and special.
Outcome 2
Apply statistical process control tools to workplace situations.
Evidence requirements
2.1
Application of tools ensures the validity of the results.
Range
2.2
Charts are designed and constructed to meet the requirements of the situation,
and ensure validity of interpretation.
Range
2.3
sampling frequency, target values.
control limits, sample size, selection of scale, use of historical
data.
Data is processed and/or plotted to the level of accuracy required for the
situation.
Outcome 3
Interpret the results of statistical process control and take action.
Evidence requirements
3.1
Interpretation of results identifies process characteristics required for decision
making.
Range
3.2
characteristics – degree of capability or incapability, degree of
control or out-of-control, degree of process stability, trends.
Actions are taken on the basis of valid interpretation of results.
Range
Planned review date
selection of process, adjustment of process, selection of process
specifications.
31 December 2019
NZQA National Qualifications Services
SSB Code 130301
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
8089 version 7
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
31 August 1996
31 December 2016
Revision
2
7 September 1999
31 December 2016
Review
3
22 September 2004
31 December 2016
Rollover and
Revision
4
18 July 2008
31 December 2016
Rollover and
Revision
5
17 November 2011
31 December 2016
Rollover
6
18 April 2013
31 December 2018
Rollover
7
16 April 2015
N/A
Consent and Moderation Requirements (CMR) reference
0113
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact NZQA National Qualifications Services nqs@nzqa.govt.nz if you wish to
suggest changes to the content of this unit standard.
NZQA National Qualifications Services
SSB Code 130301
 New Zealand Qualifications Authority 2016