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Pair Programming

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Pair programming is an XP practice where two programmers work together on a single task using a single computer. One person, the 'driver,' writes and controls the code, while the other person, the 'navigator,' reviews the code and provides suggestions and improvements. The roles are frequently rotated to ensure both perspectives are applied to the problem. This collaborative approach helps create higher quality code with fewer errors and promotes knowledge sharing among the team. Pair programming also encourages better communication within the team, which can lead to more effective problem-solving and a stronger overall development process.

Pair Programming: A Comprehensive Guide and Exam Tips

Pair programming is a fundamental aspect of Agile methodologies, particularly Extreme Programming. It is a developmental approach where two programmers share one workstation, routinely referred to as 'driver' and 'navigator'. The 'driver' handles the mechanic part of coding while the 'navigator' supervises, providing strategic guidance.

Why Is it Important?
Pair programming enhances productivity, prevents code errors, leverages collaborative problem-solving, and allows knowledge sharing amongst programmers.

What is Pair Programming?
It is a coding technique used in Agile and Extreme Programming where two software developers share a single workstation and work together on the same code. The major players are 'driver' (physically codes the program) and 'navigator'(reviews the coding task).

How Does it Work?
Pair Programming works in a pretty straightforward way. Coders switch roles between 'driver' and 'navigator'. Although only one person is typing, both are actively engaged in problem-solving and code development, intensifying a well-refined output.

Exam Tips: Answering Questions on Pair Programming
- Understand the roles: You must understand the different roles (driver and navigator) in pair programming and the duties of each.
- Benefits and limitations: Be prepared to discuss the advantages and drawbacks of pair programming. This could be pivotal to understanding the context where this approach best fits.
- Pair programming vs traditional programming: Examiners may want to test your understanding of the fundamental differences between pair programming and other coding practices.
- Real-world examples: Use real-world examples in your answers to substantiate your understanding and display practical knowledge.
Remember, each coder brings unique perspectives and solutions, making pair programming an effective approach to software development.

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Agile Project Management - Extreme Programming (XP) Example Questions

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Question 1

Amy and Tim are working on a complex function using pair programming. They are considering to take breaks instead of coding for long hours. What should they do?

Correct Answer: Take regular, short breaks during the session to maintain focus and productivity.

Taking regular, short breaks is beneficial to maintain focus and productivity during pair programming as it helps avoid burnout.

Question 2

You are overseeing a pair programming session between two team members, Anna and Mark. They find themselves in a situation where they frequently switch roles but are not making much headway. What should be their course of action?

Correct Answer: They should continue switching roles but also ensure they are thoroughly involved in meaningful discussions about the problem at hand.

In a pair programming session, the key to productivity isn't just about switching roles but ensuring that both coders are actively engaging with the problem. Anna and Mark should continue switching roles to maintain fresh perspectives, but also ensure they are thoroughly involved in discussions about the problems they are trying to solve. This active engagement will enable them to gain a deeper understanding of the problem and thus lead to a more effective solution. The answer suggesting they should stop switching roles is not as effective. Employing different perspectives is one of the main strengths of pair programming. Working independently on separate problems misses the point of pair programming altogether as it's designed for collaboration and tackling problems as a team. The final answer suggesting one person takes the lead while the other observes also contradicts the fundamental principles of pair programming. Both coders should be actively involved in the process and switching roles regularly.

Question 3

In a new team, Nancy is finding it hard to adapt to pair programming, as Brian is usually dominating their sessions. What should they do?

Correct Answer: Establish roles (driver and navigator) and switch them regularly during a session.

Establishing roles for driver and navigator ensures active collaboration and encourages equal contribution. Switching roles regularly will allow both Nancy and Brian to drive and navigate equally.

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