The first global assembly of the Open forum on CSOs’ development effectiveness took place in Istanbul from 27 to 30 September 2010. The CSOs reached consensus on a set of eight global development effectiveness principles (the so called Istanbul Principles) and on essential elements for Enabling Environment . The principles and the elements on enabling environment constitute the actual ‘Framework for CSOs development effectiveness’, which is supposed to be the basis for the over-all advocacy strategy and goals of the Open forum.