It has always been the case that talented individuals with an innate understanding of their subject have been able to produce works of outstanding performance. The purpose of engineering science is to define ways in which such achievements can be made on a regular,predictable basis with a high degree of confidence in success. Some tools, such as computers, have enabled an increase in speed and accuracy, whilst others have given a dramatic increase in the insight into the operation or behavior of materials; the electron microscope for instance. Still others have enabled the creation of devices on a scale unimaginable to our predecessors, Molecular Beam Epitaxy for example. This work is the product of the availability of an understanding of complex theory on microwave transistor operation, significant increases in mathematical processing and data handling, and the assembly of a ‘tool’ that not only allows the measurement of high frequency waveforms, but their manipulation to simultaneously create the environments envisioned by the design engineer. It extends the operation of previous narrow band active load pull measurement systems to 40GHz and importantly facilitates the design of high efficiency modes at X band. The main tenant of this work is to propose that rather than the linear approach of characterisation, design, test, re-iterate, that has been the standard approach to MMIC design to date, the first three stages should be integrated into a single approach which should obviate the need for design reiteration. The result of this approach should be better performance from amplifier designs, greater probability of success first time, and lower costs through less wafer real estate being consumed and fewer sign ‘spins’.