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The Project Management Institute references the seven basic tools in A Guide to the Project Management Body of Knowledge as an example of a set of general tools useful for planning or controlling project quality. [9] The seven basic tools stand in contrast to more advanced statistical methods such as survey sampling, acceptance sampling ...
Quality inspector in a Volkseigener Betrieb sewing machine parts factory in Dresden, East Germany, 1977. Quality control (QC) is a process by which entities review the quality of all factors involved in production. ISO 9000 defines quality control as "a part of quality management focused on fulfilling quality requirements". [1]
Kaoru Ishikawa identified five uses for check sheets in quality control: [3]: 30 To check the shape of the probability distribution of a process; To quantify defects by type; To quantify defects by location; To quantify defects by cause (machine, worker) To keep track of the completion of steps in a multistep procedure (in other words, as a ...
A control chart is a more specific kind of run chart. The control chart is one of the seven basic tools of quality control, which also include the histogram, pareto chart, check sheet, cause and effect diagram, flowchart and scatter diagram. Control charts prevent unnecessary process adjustments, provide information about process capability ...
For a 1 meter wide web, for instance, 100 - 200 measurement values are taken. These measurement values from a single scan (profile points) are called 'raw profiles'. In modern quality control systems, the width of these data boxes can be changed, and accurate profiles can be formed using several thousands profile data boxes.
The first edition of Juran's Quality Control Handbook was published in 1951. He also developed the "Juran's trilogy", an approach to cross-functional management that is composed of three managerial processes: quality planning, quality control, and quality improvement. These functions all play a vital role when evaluating quality.
This tool is used to plan the appropriate sequence or schedule for a set of tasks and related subtasks. It is used when subtasks must occur in parallel. The diagram helps in determining the critical path (longest sequence of tasks). The purpose is to help people sequentially define, organize, and manage a complex set of activities.
Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.