The growing competition and customer needs have called for shorter system development time while embracing the changes and quality challenges. These system development methods, tools, techniques, and practices are collectively known as rapid system development (RSD). This collection is growing and has received significant attention in the current challenging and unprecedented market conditions. The authors upon studying these RSD methods, tools, and techniques identify four basic patterns that address rapidity. These four patterns are iteration (cycle), increment (release, evolution), concurrency, and feedback control. This paper discusses in detail about these four patterns and their benefits
