They found that 11 %, 21% and 34% of countries are currently misclassified in the development bins due to the three sources of data error. The authors suggest that the United Nations should stopthe practice of classifying countries into development bins because the cut-off values seem arbitrary, can provide incentives for strategic behavior in reporting official statistics, and have the potential to misguide politicians, investors, charity donors and the public who use the HDI at large. In 2010 the UNDP reacted to the criticism and updated the thresholds to classify nations as low, medium, and high human development countries. In a comment to "The Economist" in early January 2011, the Human Development Report Office responded to a January 6, 2011 article in the magazine which discusses the Wolff "et al." paper. The Human Development Report Office states that they undertook a systematic revision of the methods used for the calculation of the HDI and that the new methodology directly addresses the critique by Wolff "et al." in that it generates a system for continuous updating of the human development categories whenever formula or data revisions take place.