# Expr Language - Variables

Variables are user-defined names, which represent *attributes*, such as:

Jira issue fields

Calculated attributes like Progress

Structure-specific attributes like Item type

Attributes provided by other Jira apps

Another formula

Values from another Structure column

**Naming Variables**

Variables can contain letters (English only), numbers or underscore ("_") characters. Variables cannot contain spaces, and the first character must be a letter or an underscore.

Examples:

`priority`

`sprintName`

`remaining_estimate`

`abc11`

As you write your formula, Structure attempts to map your variables to well-known attributes.For example, the "remaining_estimate" variable above will automatically be mapped to the Remaining Estimate field. See Mapping Variables for more information.

Variable names are case-insensitive. `Priority`

, `priority`

and `pRiOrItY`

will all refer to the **same** variable.

## Local Variables

Local variables are helpful when an expression needs to be used in the same formula several times. For example:

```
IF time_spent + remaining_estimate > 0 :
time_spent / (time_spent + remaining_estimate)
```

You can see that in this formula we are using "`time_spent + remaining_estimate"`

twice – once when we check that it's not zero (so we don't divide by zero) and again when we divide by it.

Instead of repeating the expression every time, we can rewrite this formula using the` WITH `

construct:

```
WITH total_time = time_spent + remaining_estimate :
IF total_time > 0 :
time_spent / total_time
```

You can define multiple local variables in succession. You can also use previously defined local variables when defining additional local variables. For example:

```
WITH total_time = time_spent + remaining_estimate :
WITH progress = (IF total_time > 0 : time_spent / total_time) :
IF(progress > 0.5, "Great Progress!", progress > 0.2, "Good Progress", "Needs Progress!")
```

Note the position of the colon ("`:"`

) – it must be present where each local variable definition ends.