The tenor of the first few sentences of the Preface succinctly outlines the need for the promulgation of Article 19.
 
Information is the oxygen of democracy. If people do not know what is happening in their society, if the actions of those who rule them are hidden, then they cannot take a meaningful part in the affairs of that society. But information is not just a necessity for people – it is an essential part of good government. Bad government needs secrecy to survive. It allows inefficiency, wastefulness and corruption to thrive.

Here is the link to Article 19:

http://www.article19.org/data/files/pdfs/standards/righttoknow.pdf