interested firms should write, to ask for the invitation to bid documents,preferably by email to the bidofficer@uneca.org or by fax to +251-1-511874,or can collect the documents from room no.2s13 of UNECA Secretariat building at addis ababa,ethiopia,between 09:00 to 13:00 hours and 14:30 to 17:00 hours on mondays through fridays between the dates of 21 december 2005 and 31 january 2006.