spiral model it is just like rounding in each round there 
will be uotpur each output will be tested at end of each 
cycle and rebuiled the apllication it normally done to 
machine critical apllictions
where as in prototype type model for first time one dammy 
prject will be made then originel will be made

Hi,

Prototype Model: when the client is not clear with 
requirment one dummy project is created presented to the 
clint according to the clinet suggestions the will be 
created .......

Spiral Model: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.