OPUS Work Package (WP) 1 - State-of-the-Art on an Ecosystem for Open Science conducted an analysis of initiatives and literature to reform research(er) assessment and incentivise and reward Open Science. This WP kicked off the OPUS project, with a view not only to landscaping content, but also to providing direct input to: Identification of incentives for Open Science (Rewards and Incentives for Researchers) – project WP2; Identification of metrics and indicators for Open Science (Rewards and Incentives for Researchers) – project WP3. Within WP1, Task 1.1 ran a State-of-the-Art on Open Science Initiatives. This task covered landscaping of:2 framework programme projects linked to Open Science; key experts, organisations and networks linked to Open Science. It also produced a stakeholder engagement plan, focusing on means of engaging key target actors to support the stakeholder input and validation sessions in WP2 and WP3. Deliverable 1.1 “Initial State of the Art on Open Science Initiatives” has the overall objective to present the results of this landscaping. It provides an initial structured input to the project’s overall objective to “develop coordination and support measures to reform the assessment of research and researchers at Research Performing Organisations (RPOs) and Research Funding Organisations (RFOs) towards a system that incentivises and rewards researchers to practise Open Science”. Deliverable 1.1 was developed as a collaborative effort between all partners involved in WP1, with one coordinating partner, sub-task leaders and contribution from all partners. The subsequent chapters of this deliverable are structured as follows: Chapter 2 - Landscaping of Framework Projects Chapter 3 - Landscaping of Experts, Organisations and Networks and Schemes Chapter 4 - Stakeholder Engagement Plan Chapter 5 - Conclusions Annexes