1. Broad square ridges devoid of undercuts and bony abnormalities.
2. Definite cuspid eminences and alveolar tubercules; a broad palate with uniform depth of vault in the maxillary arch.
3. Broad buccal shelf and firm retromolar papillae in the mandibular arch.
4. A definite vestibular fornix, devoid of muscle attachments.
5. Frenum attachments high in the maxillary and low in the mandibular arches.
6. A clearly defined and well-developed lingual sulcus.
7. A lateral throat form that allows suitable extension into the retromylohyoid space.
8. A firm mucosal covering over the denture-bearing area.
9. Mucous membrane in the vestibule fornix and floor of the mouth which is loosely and movably attached for denture seal.
10. A gradually sloping palate with a passive reflection at the junction of the hard and soft palate.
11. A tongue normal in size, position, and function.
12. A normally related maxilla to mandible.
13. Good muscle tonus and coordination in mandibular movements.
14. Adequate inter-ridge space for the favourable placement of teeth
15. Saliva of suitable viscosity and quantity
16. Hard and soft tissues devoid of any signs of pathologic disorder.

Reference: Syllabus of Complete Denture By HEARTWELL – 4th edition