Janossy provides a comprehensive overview of MVS job control language (JCL), as well as extensive examples of its use. He clearly describes the features and components of JCL, using executable JCL examples.

In addition to JCL, Janossy describes the hardware and software environments in which the JCL executes. He provides clear descriptions of the hardware and software consequences of the JCL statements. For the interested reader, Janossy explains the what, when, and why of using particular JCL statements.