Please kindly introduce the Agile Methodology

Developers and testers can focus on writing code and writing test cases. They don’t have to work with stakeholders to determine what the product requirements are.

What the team is going to deliver is more predictable. Because the product requirements are documented and approved prior to the beginning of development, there is a commitment to deliver a specific set of features which makes the final product more predictable.

3. 
   Why should we use the Delphi Panel for measuring and sizing the software package?
   

The Delphi Technique can be an especially useful research methodology when there is no true or knowable answer, such as decision-making, policy, or long-range forecasting. A wide range of opinions can be included, which can be useful in cases where relying on a single expert would lead to bias.

The Delphi technique was recommended as the method of choice when:

• 
  subjective statements made on a collective basis are desired;
  
• 
  face-to-face interaction is difficult due to large sample sizes;
  
• 
  anonymity is preferred, such as when issues are intractable or political; and
  
• 
  there is a chance of domination of a group discuss by one person.