<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The spiral model is a risk - driven process model generator for software projects . Based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental, waterfall, or evolutionary prototyping . </P> <P> This model was first described by Barry Boehm in his 1986 paper "A Spiral Model of Software Development and Enhancement". In 1988 Boehm published a similar paper to a wider audience . These papers introduce a diagram that has been reproduced in many subsequent publications discussing the spiral model . </P> <P> These early papers use the term "process model" to refer to the spiral model as well as to incremental, waterfall, prototyping, and other approaches . However, the spiral model's characteristic risk - driven blending of other process models' features is already present: </P>

Who invented the spiral model of communication select one