What are the Approval Conditions?

• Set the Wait for field to Condition based on script to script more complex approvals

Anyone to approve - any user can approve and the first approval causes the activity to complete with a result of approved.
Everyone to approve - all users must approve.
First response from anyone - the first approval or rejection from any user causes the activity to complete.
Condition based on script - each time a user approves or rejects, the Approval Script is called to determine if the activity should complete.

The Approval Script field is only available when the Wait for field has the value Condition based on script.