The earliest example of equine footwear we have is made of animal hide and dates from about 600 B.C. This primitive hoof protector looks more like a horse bootie than what we think of today as a horseshoe. It was probably stuffed with dried grass or other available natural material and tied on with hide thongs.
The spiral model is a software development process combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts. The spiral model was defined by Barry Boehm in his article A Spiral Model of Software Development and Enhancement from 1985. This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters.
Cambridge, MA: Harvard University Press, 1960. Spiral curriculum, a concept widely attributed to Jerome Bruner [1], refers to a curriculum design in which key concepts are presented repeatedly throughout the curriculum, but with deepening layers of complexity, or in different applications.ver the past several years, UDMâs Electrical & Computer Engineering (ECE) program has designed and implemented such a spiral curriculum, built on a robotics theme. In their very first semester at the university, all engineering students complete a hands robotics project that introduces concepts related to mechatronics.