Dear All stat I was wondering, if I would be given advice or help with the following task: I have to conduct a literature review, on which a comparative analysis of methodologies applied on measuring different types of additions is done. Additionally, I have to compare data obtained with the research methodologies. The scope of my research is limited to four countries: UK, USA, Brazil and Mexico. Given this, I have the following inquiries 1) Could you please suggest literature, which discusses the topic of additions and its methodologies of study, on the mentioned countries? (With a particular interest on UK) 2) Could you please suggest the main websites, where, I can collect data and research methodologies, about the topic of additions on UK? I deeply appreciate any suggestion , which help me to conduct this job. Thank you very much Merry christmas! :-) Igor Barahona You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.