The design of MMOs is often more complicated than other types of video games due to the unique nature of the MMO industry. The game design itself is a huge process as years of content must be planned for and created. In addition, systems must be designed and maintained to manage the online community and keep customers engaged and interested in the game world.
MMO Design also involves challenging decisions regarding business model. Subscriptions, microtransactions, expansions, Real Money Trade (RMT), virtual asset sales (VAS), free to play with purchased extras, and item malls are just a few possibilities.
MMO developers must take steps to keep their game worlds alive and vibrant. This can be done through live events, content expansions that alter the world, or a little of both.
Finally, an MMO requires constant content additions and ongoing management of customer service. This makes the design process of an MMO something that does not stop when the game is released.