Proficiency Testing: An Essential Element of Laboratory Performance Evaluation and Accreditation

Kirkpatrick, Denise; Horlick, J

doi:10.1520/stp28565s

Cited by 4 publications

(3 citation statements)

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“…In the assessment of a laboratory's competence, important criteria include the education, training, technical knowledge, and experience of its staff; its equipment and reference materials; its standard operating procedures; and its quality assurance system. Although a laboratory's facilities, equipment, and personnel may be assessed through questionnaires and on-site examination, the actual ability of a laboratory to produce reliable testing results can only be verified by examining its performance through proficiency testing (Kirkpatrick and Horlick, 1983). …”

Section: Introductionmentioning

confidence: 99%

“…The first type monitors and evaluates a laboratory's performance. Such studies are generally called proficiency testing studies, interlaboratory performance evaluation studies, or interlaboratory comparison studies (Twomey, 1983; Kirkpatrick and Horlick, 1983; Britton and Lewis, 1986; ASTM, 1995e; Dilbeck and Honsa, 1989, Lawn, et al , 1997). The second type of interlaboratory study determines the precision and bias of a test method (Youden and Steiner, 1975; Scott, et al , 1990; Kristiansen, 1991; Mandel, 1991, 1994, 1997; ASTM, 1995b).…”

Section: Introductionmentioning

confidence: 99%

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Statistical scoring procedures applicable to laboratory performance evaluation

Hedayat

Streets

2008

Journal of Statistical Planning and Inference

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Two statistical scoring procedures based on p-values have been developed to evaluate the overall performance of analytical laboratories performing environmental measurements. The overall score of bias and standing are used to determine how consistently a laboratory is able to measure the true (unknown) value correctly over time. The overall score of precision and standing are used to determine how well a laboratory is able to reproduce its measurements in the long run. Criteria are established for qualitatively labeling measurements as Acceptable, Warning, and Not Acceptable, and for identifying areas where laboratories should re-evaluate their measurement procedures. These statistical scoring procedures are applied to two real environmental data sets.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical scoring procedures applicable to laboratory performance evaluation

Hedayat

Streets

2008

Journal of Statistical Planning and Inference

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“…Information obtained from proficiency testing helps to identify problems in a laboratory and lead to solutions. In addition to assisting laboratories in making improvements when necessary, results from proficiency testing can be used to improve test methods and contribute to the development of precision and accuracy statements [1,2]. 2 …”

Section: Introductionmentioning

confidence: 99%

Proficiency Testing for Evaluating Aerospace Materials Test Anomalies

Hirsch¹,

Motto²,

Peyton³

et al.

Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres: 11th Volume

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ASTM G 86 and ASTM G 74 are commonly used to evaluate materials susceptibility to ignition in liquid and gaseous oxygen systems. However, the methods have been known for their lack of repeatability. The inherent problems identified with the test logic would either not allow precise identification or the magnitude of problems related to running the tests, such as lack of consistency of systems performance, lack of adherence to procedures, etc. Excessive variability leads to increasing instances of accepting the null hypothesis erroneously, and so to the false logical deduction that problems are nonexistent when they really do exist. This paper attempts to develop and recommend an approach that could lead to increased accuracy in problem diagnostics by using the 50% reactivity point, which has been shown to be more repeatable. The initial tests conducted indicate that PTFE and Viton ® A (for pneumatic impact) and Buna S (for mechanical impact) would be good choices for additional testing and consideration for inter-laboratory evaluations. The approach presented could also be used to evaluate variable effects with increased confidence and tolerance optimization.

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NVLAP and the Thermal Insulation Proficiency Testing Program

Horlick

Berger

1985

Journal of Thermal Insulation

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This paper describes the National Voluntary Laboratory Accreditation Pro gram (NVLAP), administered by the National Bureau of Standards, and sum marizes the proficiency testing program for the Thermal Insulation Materials Laboratory Accreditation Program (Insulation LAP). NVLAP and its procedures for assessing, evaluating, and accrediting laboratories are presented briefly. The scope of the Insulation LAP is described. The results of the proficiency testing program over a four year period of testing are given. Eight tables show the sta tistical results of data submitted by participating laboratories for thermal trans mission properties, thermal conductance, surface flammability, settled density, critical radiant flux, and smoldering combustion.

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Proficiency Testing: An Essential Element of Laboratory Performance Evaluation and Accreditation

Cited by 4 publications

References 0 publications

Statistical scoring procedures applicable to laboratory performance evaluation

Statistical scoring procedures applicable to laboratory performance evaluation

Proficiency Testing for Evaluating Aerospace Materials Test Anomalies

NVLAP and the Thermal Insulation Proficiency Testing Program

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