A more radical way of dealing with the difficulties of collective responsibility is the suspension of the doctrine to allow open dissent within specified limits. This is likely where the political disagreement is of great magnitude and the Prime Minister finds it more expedient to suspend the doctrine temporarily. This occurred in 1975 in relation to the referendum on the membership of the European Communities. (See Loveland pp 270-273.) Another more recent example of this came with the referendum on the Alternative Vote system in May 2011.