In many African countries, fixed broadband does not even exist. The box on the right explains the contribution of each of the three sub-indices indicating that the largest component of the rise in EGDI comes from improvements in OSI. This shows that investment in OSI is the fastest means of improving a country's EGDI rankings. However, the graph also shows the importance of investing in infrastructure and human capital in the long term. While improvements in both infrastructure and human capital have been slower, they are equally important for a healthy and functioning e-government system.