However, it soon became apparent that the task required more than part-time attention, and the following year, after raising $300,000 from their colleagues, Karnofsky and Hassenfeld left their jobs and began working full-time for GiveWell and its associated grant-making body, The Clear Fund. They invited charities to apply for grants of $25,000 in five broad humanitarian categories, with the application process demanding the kind of information that they had been seeking.