The "Select Cases: If"  input box here contains a select-list box on the left containing all the variables in thee
dataset, a field on the upper right where you can type the condition necessary for the selection of cases, and
a set of buttons below the field (similar to those in the "Compute" dialog box discussed earlier) that can help you
write the condition in the field above.

In this particular example, we wanted to select cases based on how long they had worked
at the company, measured by the variable jobtime. We wanted to select only employees who had woked longer than 72 months.
To do this, we enter the expression jobtime>72 in the box. If you can't remember the name of the variable you want,
you can select the variable jobtime from the select-list on the left, then hit Tab and Enter. This should enter the variable
jobtime into the field that specifies the condition. You can then type the rest of the expression.

To save the command and exit back to the main "Select Cases" dialog box, you can hit Tab twice, or until the
Continue button is selected, then hit Enter.