Modified Nominal/Target Control Charts–A Case Study in Supplier Development

Vermani, Sanjeev

doi:10.1080/10686967.2003.11919080

Cited by 3 publications

(7 citation statements)

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“…Similarly, Vermani (2003) explored the need for using modified nominal/target control charts through a case study. In this regard, a technique is described by which the nominal/target charts can be modified without increasing the length of control charts.…”

Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

“…In this regard, a technique is described by which the nominal/target charts can be modified without increasing the length of control charts. Further, Vermani (2003) stressed the need for the development of appropriate tools (control charts) for process monitoring that need modifications to the conventional methods. It is argued if such process monitoring tools are tailored to the specific needs (i.e., VoC), then they can help to come out with right products the first time itself.…”

Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

“…It is argued if such process monitoring tools are tailored to the specific needs (i.e., VoC), then they can help to come out with right products the first time itself. Vermani (2003) highlighted the situations under which the modified control chart eliminates the risk of a false alarm that the process has shifted and also the possibility of a freak event being misinterpreted as a process shift.…”

Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

“…This necessitated the link between control limits and specification limits so as to make right the first time. Though research on linking specification limits and control limits is scarce due to presumed reasons, there are only few studies that highlighted the importance of linking specification limits and control limits (e.g., Hill, 1956;Carr, 1989;Vermani, 2003;Ravichandran, 2006Ravichandran, , 2016Ravichandran, , 2017. While Hill (1956) and Carr (1989) proposed modified control charts by linking control limits and specification limits, Vermani (2003) studied the need for using modified nominal/target control charts using the specification requirements.…”

Section: Introductionmentioning

confidence: 99%

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A review of specification limits and control limits from the perspective of Six Sigma quality processes

Ravichandran

2019

IJSSCA

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While specification limits represent voice of the customer, control limits address voice of the process. Specification limits and control limits are treated as independent entities until modified control limits are proposed which stress the need for control limits to keep satisfying specification requirements as well. High quality processes always attempt to provide products right the first time where specification requirements are checked for controlled processes. This calls for a strong link between control limits and specification limits. A house of quality-like representation can be used to describe such a link. It is preferred to intertwine the features of specification limits with the construction of control limits to achieve right the first time. In this paper, a critical review on specification limits and control limits is made from the perspective of Six Sigma quality and the need for a strong bond between the two is stressed.

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Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

Section: Some Speculations On Control Limits and Specification Limitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A review of specification limits and control limits from the perspective of Six Sigma quality processes

Ravichandran

2019

IJSSCA

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“…Destacan las aplicaciones en el ámbito de los estudios clínicos (Minne et al, 2012a,b) y al control presupuestario en fábricas y empresas (Krehbiel et al, 2007(Krehbiel et al, , 2013. Vermani (2000) y Torbeck (2005) presentan adaptaciones del precontrol a sendos casos en las industrias aeronáutica militar y farmacéutica, respectivamente; ambas propuestas son desarrolladas en la sección 2.3. una cierta probabilidad de rechazo ante una partida con una determinada desviación inaceptable, en el contexto de muestreos de aceptación. 10 USL…”

Section: Aplicación Del Precontrolunclassified

Precontrol óptimo. Caracterización, análisis y técnicas de resolución.

Bosch¹

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El precontrol es una herramienta para el control de la calidad que tiene como objeto evaluar la aptitud de un proceso para producir piezas dentro de unas especificaciones dadas. Es usada, entre otros contextos, en la validación de la puesta a punto de procesos con ciclos de ejecución cortos. Basa su funcionamiento en la comparación de las sucesivas observaciones individuales muestreadas frente a los límites de tolerancia y los llamados límites de precontrol, y utiliza conteos acumulados para emitir un juicio sobre la validez del proceso. Es una técnica sencilla, rápida y fácil de aplicar.El hecho de que, en su versión original, la técnica del precontrol no tenga en cuenta la variabilidad natural del proceso objeto de monitorización, unido a la sencillez de su diseño, provocan que, bajo ciertas circunstancias, su comportamiento no sea tan eficaz como sería deseable, en términos de la tasa de falsa alarma y de la potencia para detectar desviaciones inaceptables, hasta el punto de que algunos autores rechazan su uso. En este sentido, existen en la literatura diversas propuestas encaminadas a mejorar el comportamiento de la técnica original mediante la modificación, en mayor o menor medida, de sus reglas de funcionamiento.En esta tesis doctoral se aborda la mejora del precontrol como herramienta para la cualificación de procesos, a través de la determinación óptima de los parámetros que rigen su comportamiento, utilizando técnicas de programación no lineal entera mixta. El objetivo es desarrollar una metodología para automatizar el proceso de elección del valor de los v Paraules clau: precontrol, control de qualitat, qualificació de processos, optimització, programació no lineal entera mixta, cerca enumerativa, mètodes de cerca d'arrels.

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