Parliament must be representative of our society and that requires a substantial increase in the number of women which only positive discrimination can achieve  In a 'representative' democracy it is vital that every part of the population be accurately and proportionately represented. The present lack of female voices in parliaments across the world symbolises the continuing patriarchal societal bias. Women are over half of the population, yet less than 20% of the House of Commons is made up of women. As of 2011, there are only 72 women (constituting 16.6% of all Representatives) serving in the House of Representatives in the US. In order to truly have a representative government, numbers must be increased to fairly mirror numbers in society. All women shortlists and other artificial means are a quick and effective way of doing this. Even David Cameron, a traditional opponent to positive discrimination for women, when asked whether a meritocracy was more desirable, said "It doesn't work"; "we tried that for years and the rate of change was too slow. If you just open the door and say 'you're welcome, come in,' and all they see is a wave of white [male] faces, it's not very welcoming"1.Indeed, a recent report by the Hansard Society2 said that the numbers of women in UK Parliament could fall unless positive action is taken3. Sarah Childs, launching the report, said that "unless all parties use equality guarantees, such as all-women shortlists, it is most unlikely that they will select women in vacant seats" 3. Compulsion is necessary to begin to achieve parity of representation4. The Labour party used all-women shortlists in the 1990's and many well-known female MPs were elected this way. Positive action is vital for reasons of justice and fairness.  1 'David Cameron: I will impose all-women shortlists' by Rosa Prince, The Telegraph, 18th February 2010  2 The Hansard Society  3 'All-women shortlists a must, says report' by Oliver King, The Guardian, 15th November 2005  4 'Call for all-women shortlists' by David Bentley, The Independent, 11th January 2010