This is the Commonwealth-standard system devised by the United Church Bureau of Supra-Commonwealth Registry for the protection of less-developed worlds that may not be ready to join galactic civilization, to give them an opportunity to develop on their own, and for regulation of commercial purposes.
Class I
Class II
Class III
Class IVa
Class IVb
Class V
Class VI
Class VIIa
Class VIIb
Class VIII
Class IXa
Class IXb
Class X
UNDER EDICT.
General Addenda:
1-All habitable planets are to be reported to the Church Bureau of Supra-Commonwealth Registry. Application for development may be filed within the specified time period thereafter. Any outpost or proposed colony site must be inspected and approved by the Bureau.
2-All habitable worlds have at least one scientific outpost or trading center.
3-No advanced weaponry may be imported to planets of Class IV or V. Such imports are permitted on Class II worlds under specified conditions.
4-Under regulations for Class IV planets, exploration by Commonwealth representatives or citizens must be pre-approved by the native government.