Science and Education Publishing International Journal of Physics 2333-4886 2 4 2014 07 02 A Functional Model of Measurement in Quantum Theory 96 104 EN Hans H. Diel Diel Software Beratung und Entwicklung, Seestr. 102, 71067 Sindelfingen, Germany IJP2014241 10.12691/ijp-2-4-1 2014 06 16 2014 06 27 2014 07 02 The measurement problem of quantum theory (QT) is the unsolved problem of how the probabilistic predictions of QT are turned into definite measurement results. A related question is whether a measurement in QT implies a collapse of the wave function and what the collapse of the wave function exactly means. Theories proposed on these subjects have not found general agreements among physicists. This paper proposes a solution to the QT measurement problem in terms of a functional model of the measurement process. A functional model describes the process of the dynamic evolution of a physical system. The model assumes that the interactions between the measured QT object and the measurement apparatus are "normal" interactions which adhere to the laws of quantum field theory.