This is a detail study of Hardware and Sofware aspects of Computer Architecture. The use of Wafare sheet and Dies. The mechanism adopted for their proper testing. The production to cost ratio. The methodology used to identify the cost of a system. Hazards that affects the system performance and reduce its life span.How can these hazards be avoided? The role of pipelining in Computer Performance. The study provides a very concise and appropriate idea of working with Computer Architecture.