Now that the basic EQS notation is understood, it’s time to see (a) how these sym­ bols can be linked together to form admissible program statements and paragraphs used in the building of an SEM input file, and (b) how to execute these input files so that the model specified can be tested. My primary aim here is to present a multi­ faceted albeit thorough overview of these program capabilities; consequently, this chapter is necessarily extensive. However, after working, through this material, I am hopeful that you will have a better “feel” for the program and a substantially better appreciation of the rich bank of model-building and model-testing resources that await you in using EQS.