In Agile, what does "pair programming" involve?

Pair programming is a collaborative technique often used in Agile software development where two developers actively work together at the same workstation. This method involves one developer, often referred to as the "driver," who writes the code, while the other, known as the "observer" or "navigator," reviews each line of code as it is written. The navigator may also think ahead about the design and potential issues, contributing ideas and suggestions during the coding process.

This approach not only helps to improve code quality through real-time feedback but also enhances knowledge sharing between team members, leading to faster problem-solving and more efficient development practices. The immediate collaboration allows for challenges to be addressed quickly, and it fosters a deeper understanding of the code being developed, which can be beneficial for both developers involved.

The other options do not accurately capture the essence of pair programming. Coding separately or reviewing code in isolation does not embody the collaborative spirit that pair programming aims to promote. Changing roles between tester and developer is a different Agile practice and does not specifically relate to the concept of pair programming.