Preface: Special Session SpS11 Strategic Plan and the Global Office of Astronomy for Development

The purpose of this Special Session 11 was to bring together the many individuals from around the world who are active in realising the spirit of the IAU strategic plan. Appropriately entitled IAU Strategic Plan and the Global Office of Astronomy for Development, this special session invited contributions relating to: (i) IAU Strategic Plan, (ii) The IAU Global Office of Astronomy for Development, (iii) Regional nodes for ``Astronomy for Development'' activities, (iv) Sector Task Forces, and (v) Volunteers and volunteer opportunities.