Unlike other e-books, these works do not remain static, but are continuously adapted to reflect the state-of-the-art. Compiled over a period of several years, each is an encyclopaedia in its own right, containing all relevant research data published until the present. They are updated on a regular basis by the authors, who scan a multitude of scientific journals for articles relevant to the topic at hand. References help the reader to verify or modify the observations of the author.

In order to facilitate the handling of this immense store of information, each e-book has been linked throughout, including the references. A search function allows the user to locate information on a specific topic without having to go through the entire contents.