Exactly a month before the final vote, all four cities bidding for the 2016 Olympics received a mix of praise and criticism Monday in an IOC report assessing their technical merits. The International Olympic Committee's evaluation report gave generally high marks to Chicago, Madrid, Rio de Janeiro and Tokyo, but also listed concerns on various grounds. Rio – seeking to take the Olympics to South America for the first time – may have gained the most, receiving the fewest direct criticisms in the report summary. Chicago, long considered a front-runner, took some hits, especially on the lack of financial guarantees. The 98-page report also cited low public support in Tokyo and a lack of understanding of different roles in Madrid. Rio bid leaders said they believed they received the best review. “The IOC report is a real boost to the Rio bid,” bid president Carlos Nuzman said. “They have provided a very strong confirmation of our games plan and vision. It is fair to say Rio has a very positive report, and possibly the most favorable. We didn't have any red points.” The report is based on technical criteria, such as venues, budgets, transportation plans and public support, and doesn't rank or grade the cities. The report is unlikely to make or break the race when the 100-plus IOC members cast their secret ballots in Copenhagen on Oct. 2. With IOC members still barred from visiting bid cities in the wake of the Salt Lake City scandal, the report is intended to offer guidance to the delegates. “The commission feels that whilst each of these cities could organize the 2016 Games, there are risks and opportunities inherent to each project which it is the commission's duty to clearly identify to the IOC members before the elect the 2016 host city,” the report said. However, IOC members tend to vote for individual reasons, including geopolitical factors, and the final presentations by the four cities in Copenhagen will also be crucial. The report is based on visits by the evaluation commission to the four cities in April and May. The IOC cited Rio's vision of using sport as a “catalyst for social integration” and said the bid was backed by strong public support, financial guarantees from all levels of government and knowledge and experience from the city's hosting of the 2007 Pan American Games. While citing Rio's “public safety challenges,” the IOC said new anti-crime programs were “already showing positive results.” The report said transportation plans in Rio would be “critical” and that urban infrastructure projects would need “careful management and monitoring.”