Initially it was controversial; the government of the day instigated both an independent review and an Honorary Royal Commission into the plan before adopting a modified version.

[2] In 1966 the MRPA commenced a review of the Region Scheme with the intent of determining whether the future expansion of Perth should occur via "clusters" or "corridors".

The intent of the Corridor Plan was to accommodate future development of the metropolitan region whilst maximising economic efficiency.

Inherited by the incoming Labor government, the plan was not initially supported by the Minister for Development and Decentralisation Herb Graham who sought an additional corridor in the north-east.

The commission concluded that the corridor planning concept was sound in principle, but identified a number of deficiencies in the report presentation and proposed implementation.