question at the end: 1) Why test is important? 2) How design phase and development

Based on the skillet you have select a business model which you can implement. Browse through internet to see more insight and trend of that business and prepare a word document which shall explain following six phrases of software development lifecycle. 1) Planning and Requirement 2) Requirement Analysis 3) Analyzing & Defining Requirements 4) Designing the software 5) Building and developing the software 6) Testing the Software 7) Development and Maintenance Also, answer these 3 question at the end: 1) Why test is important? 2) How design phase and development phase are different?