Over on the official Lord of the Rings Online website, there's a brand new developer diary posted that discusses the formula behind the creation of content for the live game. Matt "Scenario" Elliott takes us through the first part of his "Solving Problems and Making Friends" dev diary, explaining the step-by-step process he needed to take to design a number of the instances in the upcoming Book. Here's a snippet:

Originally, I planned on only allowing those with specific professions trained access to these instances (for example, only Prospectors would be able to access the two mine instances). This meant that those with a Harvesting Profession would have content specifically for them, but I found that this had the potential to greatly shrink the available player-base for the content. In the Live Environment, it is important that anything you make reaches the greatest audience possible. Because of that, I removed the Profession restriction from all instances.

You can read the entire LOTRO dev diary by clicking here!