Considering the feed back received from the first round of selected bidders, the government agency may like to amend the tender document after the end of the information exchange and market feedback period. If any such amendment is made that is made known to all bidders well in advance of the closing date. The whole process may take 4-8 months depending on the complexity of the project. Many countries (South Africa, for example) have defined procedures to be followed in the tendering stage.