States Parties and the Director-General report to the World Health Assembly on the implementation of the IHR. States Parties use a self-assessment tool for their annual reporting called the IHR States Parties Self-Assessment Annual Reporting Tool or SPAR. The SPAR tool consists of 35 indicators for the 15 IHR capacities needed to detect, assess, notify, report and respond to public health risks and acute events of domestic and international concern. For each of the 15 capacities, one to three indicators are used to measure the status of each capacity. Indicators are further broken down into attributes, which further define the indicator at each level.