The OLPC project has also been criticized for allegedly adopting a "one-shot" deployment approach with little or no technical support or teacher training, and for neglecting pilot programs and formal assessment of outcomes in favor of quick deployment. Some authors attribute this unconventional approach to the OLPC promoters' alleged focus on constructivist education and 'digital utopianism'. Mark Warschauer, a Professor of University of California at Irvine and Morgan Ames, at the time of writing, a PhD candidate at Stanford University, have pointed out that the laptop by itself does not completely fill the need of students in underprivileged countries. The "children’s machines", as they have been called, have been deployed to several countries, for example Uruguay, Peru, and in the US, Alabama, but after a relatively short time, their usage has declined considerably, sometimes because of hardware problems or breakage, in some cases, as high as 27% to 59% within the first two years, and sometimes due to a lack of knowledge on the part of the users on how to take full advantage of the machine.