The structure pane provides a graphical representation of the usage of each data mining model column in the mining model, as shown in the following diagram.

The following table describes column types in more detail.
| Column type | Description |
|---|---|
| Key Column | The column the mining model uses as a key column. The key column is an identifying column for the case set. |
| Input Column | The column the mining model uses as an attribute column for input for the case set. |
| Predictable Column | The column the mining model uses as a predictive column for output for the case set. |
| Input and Predictable Column | The column the mining model uses as an attribute column for both input and output for the case set. |