The Commission sends its new legislative proposals and consultation documents to national Parliaments, cf. Protocol No. 1 to the Lisbon Treaty. National Parliaments can submit opinions on such documents to the Commission for reply under the so-called "political dialogue".
Under Protocol No. 2 to the Lisbon Treaty a national Parliament may within an eight week deadline submit a reasoned opinion stating why it considers that a legislative draft does not comply with the principle of subsidiarity.
The links in the left-hand menu will take you to national Parliaments' opinions received by the Commission, and the Commission's replies (issued from 1 June 2009 onwards).
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Practical arrangements for the operation of the subsidiarity control mechanism under protocol no 2 of the Treaty of Lisbon: letter of President Barroso and Vice-president Wallström of 1 December 2009 [37 KB]
Commission decision to withdraw the Proposal for a COUNCIL REGULATION on the exercise of the right to take collective action within the context of the freedom of establishment and the freedom to provide services - COM(2012) 130.