In an effort to breathe as much life into an old bit of software he was having to update, Harry Roberts worked up a list of things that he sees can make things a bit more "programmer friendly" when it comes to using classes, methods and interfaces in your code.

His list of four is:

• Doc Comments
• Flexible Parameters
• Use method Entry contracts
• Be Stateful and Refactor

The "Doc Comments" is pretty obvious, but some of the others need a bit more explaining. Being flexible with your parameters is more about requiring the least from a developer, "entry contracts" being the restrictions to let the developer know what you're expecting and refactoring commonly used functionality into a easy, single point of contact.