Analysis of information sources in references of the Wikipedia article "Final Fantasy IV" in Portuguese language version.
Takashi Tokita: The planner, Hiroyuki Itoh, was watching a Formula One race. Seeing all the cars pass each other, he thought of an interesting idea where character speed would differ depending on, I suppose, the type of character it is. So, that's where the initial idea came from.
Hironobu Sakaguchi: The gameplay system [for FF9] will have a lot of customization. I cannot tell you in detail, but it will be a lot of fun... / Famitsu: I feel it to be a lot like FF6. / Hironobu Sakaguchi: Ito is the director. He made the active time battle, and after that, made several things, including the job change system.
Hironobu Sakaguchi: The gameplay system [for FF9] will have a lot of customization. I cannot tell you in detail, but it will be a lot of fun... / Famitsu: I feel it to be a lot like FF6. / Hironobu Sakaguchi: Ito is the director. He made the active time battle, and after that, made several things, including the job change system.