These can be realized with less control effort if processes follow the flow principle. To this end, this kind of PFD focuses on its purpose: It is about production processes that are as lean as possible. So we reduce complexity and thus keep the whole thing simple. In value stream diagrams, therefore, we intentionally forgo opportunities. Why run through an activity twice or three times? Why does it not succeed on the first run? Why rework?įlowchart loops hide the need to rework steps So why should it be possible to model loops in a value stream chart simply? It is not purposeful and therefore not intended.Įspecially since each loop can also be represented in a chain of similar steps, which illustrates their waste potential. They create the need for buffers and control. Loops in the process lead to eddies and bring unrest. This may also be due to the flow principle, which the value stream design declares as its goal. The value stream example shows that production processes can be modeled in a simple and understandable way. This advantage should not be underestimated. Without loops, however, no conditions need to be formulated at the branches or merges. Necessary feedback steps can be understood quite intuitively in the form of a loop, which is why most flowcharts allow loops in some form. This is because the value stream process maps are simple in that the symbols used and their arrangement are in many cases self-explanatory.ĭifferent templates to model loops in process flow diagrams Perhaps this is why value stream sketching, extracted from the Toyota Production System by Rother and Shook around the turn of the millennium, gained such popularity in the practice of many manufacturing companies. And understanding was the motivation mentioned at the beginning to deal with process diagrams. Therefore, specialized manufacturing flow charts are to be preferred to universal ones if they are to be easy to understand. A small number of symbols logically reduces the range of applications. Understandable flowcharts are therefore characterized by a small, preferably self-referential symbol range. Or to put it another way: No flowchart contributes to understanding until those involved have learned to interpret the symbols used in it in a uniform manner. But does this solve the problem? No.īecause the fact remains: Every type of diagram requires interpretation. Only one thing is clear: There are countless ways to create such diagrams professionally. In addition to the above list, there are countless software tools, each of which has its own focus or, on the contrary, sees itself as a universal tool, e.g. It’s easy to lose interest in the topic, isn’t it? Now let’s go one step further. Quantity flow diagram ( Sankey diagram).Here is an incomplete PFD list with reference to production process flows: For this reason, we know many different types of flowcharts today, some of which are perceived as modeling languages. However, they can be interpreted completely differently by different persons as long as the symbols are not standardized or self-speaking. Therein is the greatest danger of flowcharts: They are apparently easy to understand. What do the colors mean, for example? Or do the shapes have a certain meaning in the PFD? Any flow chart requires interpretation That means only the creator of the flowchart will be able to interpret it correctly. Because such a graphic is first of all free of semantics. Well, let’s say: It could create a basic understanding.
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