the feedback loop is part of the linear model of communication
Models of communication This is a one-way model to communicate with others. It consists of the sender encoding a message and channeling it to the receiver in the presence of noise. In this model there is no feedback or response which may allow for a continuous exchange of information (F.N.S. Palma, 1993).
Spiral model This model was first described by Barry Boehm in his 1986 paper "A Spiral Model of Software Development and Enhancement".[2] In 1988 Boehm published a similar paper[3] to a wider audience. These papers introduce a diagram that has been reproduced in many subsequent publications discussing the spiral model.