Importance of Requirement Figure 1-3.Cost of Requirement Errors18 1.000 1,000- 70 60- 50- 40 40 40- 30 30- 20- 15 10 10- 3 0- Requirements Design Coding Development Acceptance Operations Phase Phase Phase Testing Testing Hooks and Farray 2001 System Engineering by J.J.Gao CLGO 8+ - System Engineering by J. J. Gao 8 Importance of Requirement