Different types of data.The WV Model of Figure 4 also illustrates that the three different types of problemstypically have different types of data. Process control typically involves numeric orquantitative data (data 3 in Figure 4) for objective measurement of deviation; thus, the relevant tools are for analyzing numeric data. Proactive improvement typically involves qualitative or language data (data 1 in Figure 4) because definition of the problem is a bigger part of the task and the available data is typically words from external or internal customers; thus, the relevant techniques are for analyzing qualitative or language data. Reactive improvement typically involves a mixture of quantitative and qualitative data (data 2 in Figure 4), thus, tools and techniques for analyzing both numeric and language data must be used.
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