ACLAE
CAEAL
CAEAL Proficiency Testing
Program Design
November 22/23, 2004
CAEAL PT Workshop
1
ACLAE
Program Design
Program
CAEAL
is designed to:

Ensure comparability between laboratories of similar
performance.

Compare, through Z scores, performance over different
parameters.

Improve, over time, quality of participating laboratories.

Add credibility to a laboratory’s accreditation.
November 22/23, 2004
CAEAL PT Workshop
2
ACLAE
PT Design
CAEAL
 PT
samples checked for homogeneity and
stability
November 22/23, 2004
CAEAL PT Workshop
3
ACLAE
PT Design
Assign
CAEAL
Reference Value
 Arithmetic mean of results (outliers removed)
Value
from reference laboratory (special circumstance)
November 22/23, 2004
CAEAL PT Workshop
4
ACLAE
PT Design
Assign
CAEAL
Standard Deviation
 Standard
deviation of results (outliers removed)
 Value
from historic precision function (special
circumstance)
November 22/23, 2004
CAEAL PT Workshop
5
ACLAE
PT Design
Calculate
CAEAL
z Score for Each Result
__
z=x - X
s
November 22/23, 2004
CAEAL PT Workshop
6
ACLAE
PT Design
Assign
CAEAL
Points
z Score
Points Assigned
< 1.00
5
>1.00 - 2.00
4
>2.00 - 3.00
2
> 3.00
0
November 22/23, 2004
CAEAL PT Workshop
7
ACLAE
PT Design
Assign
CAEAL
Points
PT Score =
Total Points x
5
Pass = > 70
November 22/23, 2004
CAEAL PT Workshop
8
ACLAE
CAEAL
CAEAL Program Committee
November 22/23, 2004
CAEAL PT Workshop
9
ACLAE
Program Committee
CAEAL
Mission
To
provide CAEAL with scientific input.
To
ensure programs maintain the highest standards.
To
ensure programs meet needs of clients.
November 22/23, 2004
CAEAL PT Workshop
10
ACLAE
Program Committee
Terms
CAEAL
of Reference
To
advise CAEAL board on technical matters relating to program
operation and delivery.
Suggest
revisions to CAEAL policies and practices.
November 22/23, 2004
CAEAL PT Workshop
11
ACLAE
Program Committee
CAEAL
Membership
Appointed
by CAEAL Board of Directors.
Have
recognized expertise in fields relating to environmental
testing.
Familiar
with CAEAL programs.
November 22/23, 2004
CAEAL PT Workshop
12
ACLAE
Program Committee
CAEAL
Examples
Recommend
changes to PT concentration ranges.
Recommend
changes to evaluation procedures.
Recommend
changes to accreditation protocol.
November 22/23, 2004
CAEAL PT Workshop
13
ACLAE
Program Committee
Final
CAEAL
Say
CAEAL
Board of Directors.
November 22/23, 2004
CAEAL PT Workshop
14
ACLAE
Program Committee
CAEAL
MEMBERS
Richard Turle: Environment Canada
Suman Punani: AMEC Earth & Environmental
Harold Malle: Environment Canada
Jim McLaren: National Research Council
Mark Priddle: Beatty Franz & Associates
Graham Van Aggelen: Environment Canada
Robert Lesard: Norwest Labs
Michael Brodsky: Silliker Canada
Edgardo Alvarez: ACPO
Dave Wong: EPCOR Water Services
JoAnn DiSensi: Maxxam Analytics
November 22/23, 2004
CAEAL PT Workshop
15