In 1984, Roger Douglas was made Minister of Finance, with two associate ministers of finance, David Caygill and Richard Prebble. They became known as the "Treasury Troika" or the "Troika", and became the most powerful group in Cabinet. Douglas was the strategist, Prebble the tactician, while Caygill mastered the details. With Caygill the "nice cop" and Prebble the "nasty cop", Douglas could sometimes appear as steering a considered middle course. Later Trevor de Cleene was made undersecretary to Douglas, with special responsibility for Inland Revenue.