The sashimi model
The sashimi model, designed by Peter Degrace, is one of the models discussed in the book, Wicked Problems, Righteous Solutions: A Catalog of Modern Software Engineering Paradigms. This model assumes the same phases as the waterfall model, but that they can overlap (even more than once). This way of working means that fewer resources are wasted. In the following diagram, you can see how the phases can overlap. What matters is that there are no hard endings of phases or gateways. You can see the current time as an example. Another aspect of this figure is that, in contrast to the waterfall model, the lead time is also included in the model. This is to indicate that you can already start designing, even if the analysis is ...
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