How many movies have Joji Yanami and Tomoya Iida collaborated on?

They have worked on 3 movies together! Their first movie together was Dragon Ball Z: The World's Strongest (1990) while their highest rated movie together was Dragon Ball Z: Bardock - The Father of Goku (1990). They have not worked together since Dragon Ball Z: Lord Slug (1991). They are most known for their animation films together.