# Double-entry Verification

The options is available as an advanced option for the following question types:

* TEXT
* NUMERIC
* PHONE
* TEXTBOX

![](https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-f74aab12336a1421ee8f595cb39d86b7b49e961b%2Fdouble-entry-1.jpg?alt=media)

When this option is enabled, the users will have to answer the same question twice and **both responses MUST match**. A common use case could be the user email address, social security number and so on. This validation is performed on the device directly therefore it will work both online and **offline** reducing the chances of collecting wrong data.

{% hint style="warning" %}
The comparison is case sensitive, i.e "John" and "john" do NOT match.
{% endhint %}

Let's see it in action: on the form below we enabled the option for a *"What is your email?"* question

When the users answer this question they will have to enter the email address twice to proceed.

![](https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-4c13b291c3b8c644abe9d15fb846373af36abbdc%2Fdouble-entry-2.jpg?alt=media)

### Web application

| <img src="https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-742ea17f55d1c0b48a85a9115479df3c80ae3e69%2Fdouble-entry-3.jpg?alt=media" alt="" data-size="original"> | <img src="https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-ebe57afe09cc6821fe3c870b20626397f3d97574%2Fdouble-entry-4.jpg?alt=media" alt="" data-size="original"> |
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### Mobile application

| <img src="https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-e54f583f4765e09d6984f5de08caa0b86f12818c%2Fdouble-entry-5.jpg?alt=media" alt="" data-size="original"> | <img src="https://3293478884-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F32OIF30CgrNUuRY6IjkW%2Fuploads%2Fgit-blob-6ba8d2dc8e51632dcdea3844410040bba89f1c7b%2Fdouble-entry-6.jpg?alt=media" alt="" data-size="original"> |
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Have a look at the example project [**EC5 Double Entry Example.**](https://five.epicollect.net/project/ec5-double-entry-example)