-1. Enter an expression that will be evaluated after all child activities defined in the Until activity are executed. If the expression evaluates to true, the Until activity will execute all its child activities again. When it evaluates to false, the Until activity will complete. The expression can be a literal string expression, or any combination of dynamic [expressions, functions](control-flow-expression-language-functions.md), [system variables](control-flow-system-variables.md), or [outputs from other activities](how-to-expression-language-functions.md#examples-of-using-parameters-in-expressions). The example below checks the value of a previously defined pipeline array variable called TestVariable to see if it evaluates to ['done'].
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