Conversation so far:
What was Rem Koolhaas' proposal about the European Flag?
Rem Koolhaas and his think-tank AMO – an independent part of OMA – suggested the development of a visual language. This idea inspired a series of drawings and drafts.
What kind of symbol was the Barcode?
In the barcode, new Member States of the EU can be added without space constraints.
Why did Rem Koolhaas and his think-tank AMO decide to unite the flags?
The barcode seeks to unite the flags of the EU member countries into a single, colourful symbol. In the current European flag, there is a fixed number of stars.
Was there any opposition to making the European flag barcode?
Critics pointed the lack of capability to relate the signified (the mental concept, the European Union) with the signifier (the physical image, the stripes) as the major problem.
Was the proposal to make the European flag barcode successful?
Since the time of the first drafts of the barcode it has very rarely been officially used by commercial or political institutions.

Question: When did all this happen?
Self-contained rewrite: When did Rem Koolhaas and the European Flag proposal all happen?