For the ECB, non-standard measures have always been seen as a means of coping with abnormal functioning of some key markets, which, if unaddressed, would have posed problems for the effective transmission of monetary policy. This implies that, standard and non-standard measures are seen as complements, not substitutes.
We have never chosen non-standard measures as  BIS central bankers’ speeches  3  alternatives or substitutes for changes in official interest rates. Indeed our standard and nonstandard measures were implemented in parallel. This so-called separation principle is illustrated by the rate increases in the first half of 2011 in a context of stable or reinforced liquidity measures.