Surveys are used to create a prompt for user input. 

1. In the left panel of Ansible Tower, select Templates and then select a template you have created.
2. Select Add Survey or Edit Survey.

In this example, a survey is created that will prompt for a value that will be with the "foo" variable.

Then, when launching the job, there will be a prompt that will associate a value with the "foo" variable.

Let's say the job template is running the following playbook.

---
- hosts: all
  tasks:
  - debug:
      msg: the 'foo' variable contains a value of {{ foo }}
...

AVOID TROUBLE

The Extra Variables in Tower and set_fact module will take precedence over the prompt.

Something like this should be returned.

TASK [debug]
ok: [localhost] => {
    "msg": "the 'foo' variable contains a value of bar"
}