Basic research necessary for the development of advanced methods for clinical chemistry are reviewed. It is concluded that a new class of fast analyzers are required which are inherently adapted to computer data reduction. A new analytical system using centrifugal force to transfer and mix fluids in a multiple-cuvet rotor yields data signals at intervals of 3.3 milliseconds. It is applicable to a variety of analyses, but is especially suited to the determination of enzymes by measuring reaction rates. © 1969.