Appendix CSR 2016 – Boskalis 64 We have been reporting on our Corporate Social Responsibility (CSR) strategy, performance and results in a separate annual report since 2009. The scope of our CSR reporting is based on the information requirements of our key stakeholders. Our key stakeholders either have an influence on our license to operate or can be significantly impacted by our activities. In order to ensure we meet their information requirements we carried out a materiality analyses in 2015. Boskalis’ group management selected relevant key and sub-topics derived from Boskalis’ strategy, its activities as well as from international guidelines, regulations and legislation. Of the key stakeholder groups a total of 66 stakeholders was selected. Desk research and interviews were used to determine how important the individual sub-topics were to the stakeholders. This process was also used with the Boskalis group management to determine how important the topics were to Boskalis. Based on the results of this process the materiality matrix was determined. The findings of this analysis provided valuable input for our CSR strategy and reporting. The materiality matrix was updated in 2016 based on our engagement with our stakeholders. This dialogue confirmed that our CSR strategy and structure of our current CSR reporting is regarded as relevant and significant for our stakeholders. In 2016 we have taken steps to make the correlation between the various sections of the report clearer. These include setting up a value creation model and making a clear link between our material topics and our strategy, opportunities and risks as well as the results achieved in 2016. We strive to improve the quality of the information and where meaningful add quantitative key performance indicators. The CSR Report includes only CSR data from entities that are fully or majority owned and from joint ventures in which Boskalis has a controlling interest. However Boskalis relies on a significant number of contractors to perform daily activities. Boskalis acknowledges its responsibility for the safety of its contractors and therefore includes contractors in its safety performance reporting. Acquisitions and divestments are reported in accordance with the financial reporting rules for consolidation. This means that acquisitions are reported as from the moment control (ownership) is acquired and divestments are reported up to the moment that control is relinquished. Please refer to our Annual Report for an overview of acquisitions and divestments in 2016. ABOUT THIS REPORT Purpose and scope of the report

Reporting process

The CSR Report is compiled by a multidisciplinary CSR team under the responsibility of the Board of Management. Its contents was discussed in its entirety with the Supervisory Board. The consolidation of CSR data takes place at successive levels, starting with the projects and local office organizations, moving up through the relevant business units and staff departments and ending with the consolidated group reports. This is based on quarterly reporting, which is monitored by our Group Accounting & Reporting department in close consultation with our Corporate Communications department that is responsible for the production of the CSR Report. In addition, like in previous years, a number of internal audits were conducted on material CSR topics and indicators in 2016. The CSR data is prepared in accordance with our reporting principles, which are based on the international Global Reporting Initiative (GRI) standards. In 2016 we started reporting in accordance with the GRI G4 guidelines. The GRI G4 reference table is included on pages 66-68 of the report. KPIs are selected on the basis of interactive stakeholder dialogue and the issues relevant to Boskalis’ operations. Reporting principles

External verification

The information contained in this report faithfully represents the outcome of systematic data gathering and analysis. As in previous years, Boskalis appointed an external assurance provider to verify its key CSR metrics. Please refer to page 75 for the assurance report and conclusion of our external assurance provider.

Methods of estimation, measurement and calculation

We use generally accepted protocols to compile, measure and present information, including the GRI technical protocols for indicators comprised in the guidelines. We aim to ensure reliability of our reported data by performing internal audits and externally verifying our data. However, due to the nature of sustainability data there are some limitations associated with measuring and calculating data. No changes were made to definitions and measurement methods of the reported data compared to the 2015 reporting period.

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