Number of registers that interoperate with at least two other registers. Each register must be fully digitalised and exhaustive (i.e. all information is stored in electronic form) and the data exchange infrastructure must provide real-time updates. Registers from the following 7 authorities are considered: (a) the supreme audit institution, (b) the financial intelligence unit, (c) the tax authorities, (d) the authority responsible for financial and non-financial disclosure, (e) the police, (f) the judicial administration, (g) the prosecution authority.