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 include: Canonic Filters, the Norton Transform, Inverters, Filters with Finite Frequency Zeros.