# Binding to Model ### Setting Up Binding to the Input & Output Model After creating the [input and output model](https://docs.decisionrules.io/doc/v1/decision-tables/input-and-output), you need to bind these models to the conditions and results in the Decision Table Designer: * **Input Model**: Bound to condition columns. * **Output Model**: Bound to result columns. You can select any leaf from the input/output model as a condition or result variable. {% hint style="warning" %} Note that you cannot select a root that contains any child as a condition/result variable. {% endhint %} #### Example of binding (Input Model): 
// JSON Editor

{
  "delivery": {
    "distance": {
      "car": {},
      "ship": {},
      "plane": {}
    },
    "tariff": {}
  },
  "package": {
    "weight": {},
    "longestSide": {}
  }
}
**Simple Editor:**
From this Input Model, the following values can be selected as condition values: * `delivery.distance.car` * `delivery.distance.ship` * `delivery.distance.plane` * `delivery.tariff` * `package.weight` * `package.longestSide` ### Binding Models to Conditions and Results 1. Navigate to the **Decision Table Designer** section. 2. To bind the **Input Model** to **Conditions**: * Create a new condition column. * Select the condition variable in the column header. To bind the **Output Model** to **Results**: * Create a new result column. * Select the result variable in the column header. {% hint style="info" %} It is also possible to bind the condition columns to[ rule variables](https://docs.decisionrules.io/doc/v1/other/rule-variables) or [calculation column variables](https://docs.decisionrules.io/doc/v1/decision-table-designer#select-column-value). More information is in [Table Designer](https://docs.decisionrules.io/doc/v1/decision-table-designer#select-value-from-input-model). {% endhint %}