The supervision of banks for capital adequacy purposes is carried out on a consolidated basis, taking into account all holdings of the capital of other entities by the concerned bank. For subsidiaries, the preferred mode of consolidation is to add the assets and liabilities into the accounts of the parent on a line-by-line basis. For associate companies (i.e. where the parent bank owns 20% or more of the voting stock, and/or has voting control of the concerned company), the assets and liabilities should also be consolidated on a line-by-line basis. If banks do not wish to consolidate subsidiaries or associates (that meet the above criteria), they must contact the Central Bank to agree on the accounting treatment to be used. Participations and investments which amount to below 20% of the voting capital of the concerned company should be accounted for at fair value and weighted at 100%.