Moreover, good clearinghouses are hard to build. In many countries, one needs to worry about corruption, erosion of privacy, lack of complete and accurate information, and technical capacity, as well as fragmented credit information availability and restrictions on what type of institution may use the data. In the United States, credit bureaus were built up as voluntary process over a very long time. In developing countries, microfinance institutions might work together to broaden access to existing credit clearinghouses, so that a wider range of institutions can have access to the credit data, a wider range of borrowers are recorded in the system, and both positive and negative credit histories are recorded, rather than simply focusing on negative reporting. Where such credit information clearinghouses do not yet exist, microfinance institutions can help to develop such clearinghouses, either privately, in conjunction with the banking sector, or through the central banks, by establishing public registries with procedures for access by a wide range of creditors.