# 12 WRITE Intro
In the write section you can formulate and edit your statements, create containers with variables and pre-check a possible output.
Containers are a core concept of the NLG Cloud: A container is a defined part of a statement, that contains different rules. You can refer between the different container of a statement. Preview possible text output Below the editing line of the statement you can see the output of a statement according your rules with the data set of the active Test Object. It represents one variant of the different possible outcomes of your defined statement.