This white paper reviews some recent MMIC designs carried out by Plextek RFI that demonstrate how highly accurate MMIC performance predictions can be achived. Close agreement between measured and modelled performance is exhibited across a wide range of circuit functions, operational frequencies and process nodes and all designs were first pass successes. Insight is also given into the design methodology associated with the development of these MMICs, in particular detailed EM simulation is essential to achieve such close agreement. All of the designs presented were developed using ADS from Keysight.