Three ""legislative controls"" placed on appropriations by congress that are related to funding are:

1. Purpose

2. Time

3. Amount

Explanation:

1. Purpose: Congress placed legislative controls on reasons for appropriating funding for project. This talks about why, where and how funding should allocated.

2. Time: This stipulated when should funding be appropriated for it effective and efficient use.

3. Amount: congress also placed legislative control on amount needed or to be appropriated for a project.