A metaphor that everyone (whole team, customers, management, stakeholders) agrees on for how the system works.
When you miss a deadline or milestone, don’t just blindly shift the planned deadline back by a day. This is an opportunity to quickly re-assess the project’s status, update the plan, and communicate the new plan to all of the … Continued
Kent Beck created four rules of Simple Design. These are sometimes referred to as The Four Commandments or the XP Simplicity Rules. The rules, in priority order, are that code should: Pass all tests Express the author’s ideas Avoid duplication … Continued
When something unexpected or exceptional happens in a software application, usually an error message is displayed to the user and/or logged somewhere for a developer to investigate. If the error is something temporary, such as a lack of a network … Continued
Collective code ownership breaks down fiefdoms within an application’s codebase. Nobody “owns” a particular part of the code. Everyone on the team is responsible for all of the code. This enables pair programming and refactoring by the whole team. It … Continued
Well-designed software must have a single, well-defined architecture. Virtually all software, regardless of how well-designed one might find it, starts out with a single architecture. Unfortunately, many applications evolve over time, sometimes going through a partial re-architecting process that never … Continued
Helps to ensure shared understanding within an XP team.
Sometimes the process of describing a problem, even to an inanimate object, can reveal the solution. Rubber duck debugging refers to the practice of using a small toy, like a rubber duck, as your first assistant when you are faced … Continued
Frequent, small releases help ensure constant communication and tight feedback loops.
Technical debt is a metaphor for all of the shortcuts, hacks, and poor design choices made for a given software system that compromised its quality, usually in an attempt to meet a deadline. It can be an appropriate business decision … Continued