# Dynamic true/false rules

Some data items held within OneVu are effectively markers/flags about something.&#x20;

These have a property of ‘Boolean’. So if we look at the following, we can see that ‘DisabledValuation’, is an example of this. This data item says True if they have a Disabled Band Reduction and False if they do not.

![DisabledValuation is an example of a data item where the answer is true or false](https://3978362562-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MgKIYotuJ2G9zOHXIfg%2F-MgPh2Bc6JjqPxTJTJuy%2F-MgPhQrkhH4oZx8wMwxf%2Fimage.png?alt=media\&token=2618991f-2867-4395-b42f-7c2773b009c6)

&#x20;We can use these to show/hide content. E.g. let’s say we want to ONLY show a question:

&#x20;_**I’ve received a reminder - what can I do?**_

&#x20;IF the data item ReminderPresent is present on an account.

As this field is a boolean type we can click the copy button and paste it in to the visibility box. Once there we need to remove the ${ } around it because we’re not trying to show it, we’re simply wanting to use in a rule i.e.&#x20;

If we only wanted to show something if the above value was false we would do this:

&#x20;AccountDetail.ReminderFlag == false

&#x20;In technical terms two equals are used to show explicitly what to check for.
