transitional measures; interim provisions
Used in legal, administrative, and policy contexts for temporary rules or arrangements that bridge an old system and a new one.
Transitional measures were established in conjunction with the shift to the new system.
These interim provisions are effective until March of next year.
暫定措置 is a provisional measure taken temporarily until a final decision is made, while 経過措置 specifically bridges an old and new system during a transition period.
Compound of 経過 (passage, progress) and 措置 (measures, steps). A straightforward Sino-Japanese legal term.