Objectives In this lesson, you learn how to create multiple observations from a single record that contains repeating blocks of data create multiple observations from a single record that contains one ID field followed by the same number of repeating fields create multiple observations from a single record that contains one ID field followed by a varying number of repeating fields. Additionally, you learn to hold the current record across iterations of the DATA step hold the current record for the next INPUT statement execute SAS statements based on a variable's value explicitly write an observation to a data set execute SAS statements while a condition is true. Prerequisites Before taking this lesson, you should have completed the following lessons Introduction to SAS Programming Working in the SAS Environment Basic Concepts Editing and Debugging SAS Programs Setting Up Your SAS Session Creating SAS Data Sets Reading Raw Data Reading Various Types of Raw Data Understanding DATA Step Processing Reading Raw Data in Fixed Fields Reading Free-Format Data