Erik Mona takes a first step toward measuring the cultural impact of Gygax and Arneson's Dungeons & Dragons by providing a pocket history of the game's generation and evolution. Mona explains the addition of character development as a game goal - the innovation that distinguishes D&D from its predecessors, and started the role-playing revolution.
The source is the essay-review on www.electronicbookreview.com written by Erik Mona.
Thirty-one years after the invention of Dungeons & Dragons, the original role-playing game remains the most popular and financially successful brand in the adventure gaming industry. This fact is so well established in the conventional wisdom of the adventure games industry that it's difficult to find adequate sourcing for the assertion, and it seems ridiculous to even try. In that time, D&D has introduced millions of readers to the concept of role-playing. Even those who eventually move on to other systems usually get their start with D&D. Most gamers' understanding of "what happens" in a role-playing game is therefore shaped by how D&D explains these concepts. ;An analysis of how D&D's manuals have explained the duties and roles of players throughout the game's many printings therefore offers a glimpse at the evolution of the role-playing form itself. If Dungeons & Dragons is the lingua franca of most role-playing gamers, its definition of the role-playing experience defines an important touchstone helpful for critical study of the role-playing phenomenon.
The quote was rewritten directly from the essay.