Cafodd Llywodraeth Cymru saith holiadur rhag-gymhwyso gan gwmnïau oedd â diddordeb mewn cymryd rhan yn y broses. Nid oedd dau ymgeisydd yn cyrraedd y trothwy cymhwyso, ac ym mis Mehefin 2011 gwahoddwyd pum ymgeisydd i gymryd rhan ymhellach:Consortiwm o dan arweiniad Balfour Beatty, gydag Alcatel-Lucent a Cable & Wireless;British Telecommunications;Geo Networks;Fujitsu;Thales.
The Welsh Government received seven pre-qualification questionnaires from companies interested in participating in the process. Two proposals did not meet the qualifying threshold and in June 2011, five short-listed bidders were invited to participate further:A Balfour Beatty led consortium, with Alcatel-Lucent and Cable & Wireless;British Telecommunications;Geo Networks;Fujitsu;Thales.