Using the Data Viewer (FileMaker Pro Advanced)
You can use the Data Viewer to monitor expressions like field values, local and global variables, and calculation formulas. You can monitor expressions while running scripts or while testing them in the Script Debugger. You can also monitor field values and variables in the database file.
The Current tab shows:
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The Watch tab monitors expressions. You can enter expressions, one per row, in the Data Viewer. When you use the Data Viewer with the Script Debugger, the Watch tab displays expressions from paused scripts letting you see how data changes as you step though a script. Expressions remain in the Watch tab until you delete them manually.
To monitor fields and variables in the currently running script:
1.
Choose Tools menu > Data Viewer, or click Open/Close data viewer button in the Script Debugger.
2.
Click the Current tab and do the following:
 
Click Add to Watch.
FileMaker Pro switches to the Watch tab where the expression appears.
To monitor expressions:
Click the Watch tab and do the following:
 
1. Select an expression, click Edit button or double-click the expression, then define or edit the expression. See Working with formulas and functions.
2. Click Evaluate Now to display the result of the expression or click Monitor to add the expression to the Watch list.
Click Refresh Values.
Notes
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Expressions remain in the Watch tab until you remove them.
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In the Current tab:
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Related topics 
Working with formulas and functions
Defining calculation fields