This chapter describes how to use the Packager program module and the Backannotation function from the Schematic Editor for performing forward and backward annotation of net list data. The examples presented with this chapter introduce the basic concepts of net list data processing and annotation in the Bartels AutoEngineer in a logical sequence. The circuit design of the preceding chapter will be prepared for further processing in the subsequent chapters. The reader should work through this chapter without missing any sections to gain full understanding of Packager and Backannotation. Once a command has been used and/or explained, the operator is assumed to have understood its function and be able to perform it again. Subsequent instructions containing this command will be less verbose for easier reading and more speedy learning.