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.
In 1958 Mao Zedong launched the great leap forward. This was to be the second five year plan under the rule of the communists or the people's republic of china, its intent was to continue the modernisation of Chinas industry which had begun during the first five year plan.n 1958 Mao Zedong launched the great leap forward. This was to be the second five year plan under the rule of the communists or the people's republic of china, its intent was to continue the modernisation of Chinas industry which had begun during the first five year plan.