Answer the following three exercises taken from Ch3. Use your own words as much as possible (based on chapter information), as SafeAssign will be used to check for plagarism. Spelling and grammar count. Please give sufficient detail for each answer (think paragraphs, not short single sentences).

• Explain how the principles underlying agile methods lead to the accelerated development and deployment of software. 
• Extreme programming expresses user requirements as stories, with each story written on a card. Discuss the advantages and disadvantages of this approach to requirements description.
• Why is it necessary to introduce some methods and documentation from plan-based approaches when scaling agile methods to larger projects that are developed by distributed development teams? 

The link for the online slide version of the book is as follows : https://www.slideshare.net/software-engineering-book/ch3-agile-sw-dev