The focus on the expectations and opinions of stakeholders, indicated by the technical stakeholder, is a fundamental step for the definition of PSC material issues. This operation took shape thanks to stakeholder engagement, a process divided into three phases:

• Identification of different categories of stakeholders. This phase was carried out following the AA1000 Stakeholder Engagement standard (AA1000SES) 2015 and led to the identification of the categories in the following table, each accompanied by its description.

Stakeholder	Definition
Worker	Employees working for or on behalf of PSC, including its representatives (e.g. trade unions)
Supplier	Provider of products or services to PSC
Customer	Customers of PSC products
Investor	Who holds shares within PSC
Society and local communities	The social context in which PSC sites are located. It can influence its activities
Institutions	The set of institutions that can influence the PSC activities (e.g. Region, Province or Municipality in which PSC sites are located)
NGO and Associations	Non-profit associations and private organizations operating in areas that influence PSC activities (e.g. environmental associations or sector associations)
Media and press	International, national and local media (e.g. television, press, radio and web) which PSC can use to communicate its initiatives

• Definition of the methods of implementation of the engagement. In 2021, all categories of stakeholders were involved indirectly: for each category, the documentation useful for reconstructing opinions and requests on material issues was selected and analyzed.
• Identification of the relevance of the issues for stakeholders, by analyzing the frequency of the issues in the selected documentation.