The CareerBliss data evaluates the key factors which affect work happiness, including: work-life balance, one's relationship with their boss and co-workers, their work environment, job resources, compensation, growth opportunities, company culture, company reputation, their daily tasks, and job control over the work that they do on a daily basis. The data accounts for how an employee values each factor as well as how important that factor is to the employee’s overall happiness. Each review is given an average score indicating where the company/job places between one and ten. Nearly 100,000 reviews were assessed to determine CareerBliss' Happiest Companies in America for 2013. For the Top 5 Happiest Jobs, all assessments are derived from April 2011 – April 2012 employee generated reviews