This is a form of Alpha asking bid. This is only used on the 2-level, and after a Beta bid. Since its only used on the 2-level you use this if parnter has less then 4 controls.
Answer: 1. step: Worse then honor third. 2. step: Honor third. 3. step: At least 4 small cards. 4. step: Minimum honor fourth. 5. step: Minimum two top honor third.