This CD-ROM course shows how to use transforms to improve filter realizability. Transforms can also change the topology to be more suitable for a technology, such as coaxial resonators or quartz resonators. The well-known tee to pi is one example transform. Other more powerful transforms and how to use them to design prcatical filters are also discussed. Topics Canonic Filters, the Norton Transform, Inverters, Filters with Finite Frequency Zeros.