Difference between Quality and Grade
Quality and grade is difference. Quality as a delivered performance or result is “the degree to which a set of inherent characteristics fulfill requirements” (ISO 9000). Grade as a design intent is a category assigned to deliverables having the same functional use but different technical characteristics. While a quality level that fails to meet quality requirements is always a problem, a low grade of quality may not be a problem. For example:
- It may not be a problem if a suitable low-grade software product (one which a limited number of features) is a high quality (no obvious defects, readable manual). In this example, the product would be appropriate for its general purpose of use.
- It may be a problem if a high-grade software product (one which numerous features) is of low quality (many defects, poorly organized user documentation). In essence, its high-grade feature set would prove ineffective and/or inefficient due to its low quality.
Difference between Accuracy and Precision
The project management team should determine the appropriate levels of accuracy and precision for use in the quality management plan. Precision is a measure of exactness. Accuracy is an assessment of correctness. For example, if the measured value of an item is very close to the true value of the characteristic being meansured. the measurement is more accurate. An illustration of this concept is the comparison of archery targets. Arrows clustered tightly in one area of the target, even if they are not clustered in the bull’s eye, are considered to have high precision. Targets where the arrows are more spread out but equidistant from the bull’s eye are considered to have the same degree of accuracy. Targets were the arrows are both tightly grouped and within the bull’s eye are considered to be both accurate and precise. Precise measurements are not necessary accurate measurements, are accurate measurements are not necessarily precise measurements.
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