The aim of this work package is to develop and validate bridges for the realisation of impedance scales that address the needs of project partners and stakeholders, as identified within Work Package 1. Digital impedance bridges appropriate to each partner’s needs will be designed and constructed in Task 2.1 in accordance with the findings of Work Package 1. NSAI and IPQ will design bridges but not construct them within this project. Within Task 2.2, flexible modularity of measurement systems and a virtual training concept for lowering the costs of implementation of the new impedance scales at project partners and stakeholders will be established. The new and modified digital bridges will be validated in Task 2.3