# Comparing classification systems
**Side-by-side comparison of classifications**
The “Compare” function lets you visually compare tables from two different classification systems or two different tables from the same system. It is useful especially, but not only, when creating a new (custom) classification system.
How to do a comparison:
In the main ICS window, click the  button.
In the “Compare Classification Systems” window that opens, pick the systems and tables you want to compare – one on the left (1) and one on the right (2).
That’s it! Now you can easily compare the structure and contents of the two tables.
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