Hi,
I assume you are talking about the process design gateway.
Your value will be saved in the custom list value variable.
It is,
variable_name == "string", or "${variable_name}" == "string".
If it is numbers, you can be sure by using builtins in Freemarker, like variable_name?number > 4.
BTW, your variables can be checked in process report > parameters tab> computed parameter.
I hope this helps,
Taka