It is a very remarkable initiative to explore the HD doctrine, its connotation of "actual domain", "reachable domain", "potential domain" and "activation probability". The study of HD is also essential for decision analysis, planning/management, and crisis management. When applied by military leaders, HD doctrine was found practical and valuable. Furthermore, it is especially the case to add a key "core basis" before the "actual domain" to complete the foundation of the HD theory. It was found very useful to do so in the military training and management according to the author which also strengthened HD doctrine in a more practical manner. The findings in this paper not only confirm the feasible and practical value in HD doctrine, but also attempt to justify the complete structure of HD doctrine.