. Editorial.- . The ESA Experience.- . The Astronomer's Pocket Guide to Astrobiology.- . Light Pollution Control:World-Wide Effects of and Efforts to Reduce Light Pollution.- . Strategies for Protecting Radio Astronomy.- . A Brief History of the Controversy Surrounding the Mount Graham International Observatory.- . Outreach at Kitt Peak Visitor Center:Techniques for Engaging the Public at a Major Observatory.- . Practical Popular Communication of Astronomy.- . The Société Astronomique de France in the Astronomical Landscape: Evolution and Prospects.- . Use and Misuse of Web Downloads - A Personal View.- . The GAVRT Partnership: Bringing the Universe to K-12 Classrooms.- . Activities in Astronomy Education of the International Astronomical Union.- . The Institute for Scientific Information and the Science Citation Index.- . The Observatory Magazine: Linking Three Centuries.- . Organizing and Managing American Astronomical Society Meetings - From Preparation and Plans to Science Presentations.- . Organization and Goals of the European Astronomical Society.- . The Selection of Tenured Astronomers in France.- . The Changing Landscape of Italian Astronomy.- . A Canadian Vision of International Astronomy and Astrophysics.- . Updated Bibliography of Socio-Astronomy.

I am most grateful to Andr¿ e Heck for his invitation to write a foreword to OSA Volume 4 - I will use this valued opportunity to emphasise those topics in Vol. 4 which I consider important even if other topics may be of even greater importance in the universal scale of things. At the outset let me say that I commend Vol. 4 to its readers - it contains much of very great interest for organisations and strategies in astronomy. A topic which I consider to be of very great importance at this time is Adverse Environmental Impact on Astronomy. There are two papers on this topic in OSA 4 - Cohen on Strategies for Protecting Radio Ast- nomy and Schwarz on Light Pollution Control. The growth in the extent of use, the power and spectral demand for radio transmission continues to increase virtually exponentially. The impact on the 'listening' services such as radio astronomy has been severe. Only by creativity in developing new techniques for radio noise (including legal transmissions) reduction and by participating fully in the allocation process for radio frequencies has radio astronomy developed to the powerful investigative tool it is today.