Refers to the different stages through which a product passes and the levels of sales experienced at each stage. Every human has a life cycle, which is, to some extent, predictable ie conception, birth, childhood, adolescence, adulthood, old age. Products also have a life cycle, most of which consist of six stages, which can be compared to the human example above: development (conception and pregnancy), launch / introduction (birth), growth (childhood and adolescence), maturity and saturation (adulthood), decline (old age). The stages of development are shown in relation to sales over time. They can also be shown in relation to cash flow.