In traditional SAS programs, PROCS are called as part of a workflow that usually includes SAS DATA steps along with PROC steps, which invoke SAS procedures. For example, a very basic SAS program includes a DATA step that creates the SAS data set from raw data files and a PROC step that invokes an appropriate SAS procedure to process the SAS data set. A PROC invocation typically takes one or more tables as input and produces a new table as output. Various programming options and control statements can also be specified on the PROC invocation. These dictate how the PROC.
