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This paper describes the product life cycle and its implications for the requirements engineering process, and proposes a research agenda for increasing the understanding of market and product maturity implications on requirements engineering. A product life cycle comprises four stages of maturity: Introduction, Growth, Maturity and Decline. All products go through these four stages of maturity du
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The paper presents Grafchart, a graphical programming language for sequential control applications. Grafcahrt has been influenced by Grafcet/SFC and Petri nets. In the paper the relations between Grafchart and Grafcet/SFC and between Grafcahrt and Petri nets are presented and discussed.