 The choice to produce the expansion was primarily inspired by the success of Morrowind's release, as well as a general feeling that Elder Scrolls series games are ongoing experiences that merit new things for their players to do. Development on the game began immediately after Morrowind shipped, giving the developers a mere five-month development cycle to release the game — a very fast cycle for the industry. The prior existence of the Construction Set, however, meant that the team "already had the tools in place to add content and features very quickly."
