SPC in the next publication (Does e

SPC in the next publication (Does et al., 1997). But issues such as interpretation of control
chart, identification of assignable causes and selection of corrective or improvement actions
are described only generally).
Other framework for the SPC implementation (Antony & Taner, 2003) is the most complex
of all. This conceptual framework covers steps such as construction of control charts and
interpretation of control charts but this suggestion suffers from the same problems as the
previous one – it offers only general well-known information about construction and
interpretation of control charts recommendation to prepare and apply OCAP including. The
only one proposal of the comprehensive framework for the SPC application with the special
emphasis on the identification of assignable causes could be found in the paper of Dasgupta
(Dasgupta, 2003). Author differs the activities linked to the identification of assignable cause
according to the stages of the control charting defined in (Palm, 2000). In deep he discusses
the problems and gives solutions for complex processes. A special attention he puts on the
retrospective process analysis from the point of view of the identification of the assignable
causes. But this proposal of the framework for the application of SPC suffers from several
shortcomings. The applied three stage methodology is not complex – it doesn´t cover
capability analysis. It is not incorporated into the whole system of the factors influencing the
effective SPC application. It doesn´t respect all phases of the general problem-solving
process. Very important phase of the selection of suitable solution (selection of the suitable
corrective or improvement action) has been in this paper defined but has not been solved
and the phase of the evaluation of the effectiveness of accepted corrective or improvement
action has not been considered at all.
The goal of this paper is to
- define complex and effective application of SPC,
- systematically determine a comprehensive system of statistical, methodological, social
and economical factors affecting the efficiency of the SPC application in relation to the
steps of so called SPC cycle,
- define SPC as a total problem-solving process,
- define and describe four variants of practically applicable methodology of the SPC
realization as a problem-solving process depending on the number of factors affecting
the process variability and the degree of the process dynamics,
- show the practical example of the application of one of variants of the suggested
methodology.
2. Complex and effective application of SPC
Complex application of SPC is such application that is realized in the frame of the following
four phases:
I. Preparatory phase;
II. Phase of verification and ensuring the process statistical stability;
III. Phase of verification and ensuring the process capability;
IV. Phase of ongoing statistical process control.
In Table 1. there is a broad list of possible factors mentioned above that are identified in the
frame of particular steps of the SPC cycle (see Fig. 2).