## 1 Introduction  
W-MySir is an information system for waste traceability, provided since 2005 by Microambiente srl ([[https://wmysir.com/](https://wmysir.com/)]([https://wmysir.com/](https://wmysir.com/)), accessed on 30 December 2022), which received the support of Conai, the Italian National Packaging Consortium (www.conai.org/en, accessed on 30 December 2022), for implementation in some Italian regions. The system provides comprehensive free information to local administrations, private companies, and citizens. It follows the pathways of the different fractions of municipal solid waste (MSW), each identified by its European waste code (EWC). This traceability is coupled with analytical quantification of waste streams, identification of selected treatment plants, and a series of other types of data and information that enable citizens and local administrations to obtain a continuous and complete picture of the current state of MSW management. Data obtainable from the W-MySir platform are all certified values coming from authorities (mainly the technical offices of various municipalities). The information system processes the data, making them available in the same format, producing figures and tables to make them more readable, and allowing comparisons between different years of management and different categories of solid wastes. The platform is largely utilised by municipalities to monitor the quantitative and qualitative degree of separate collections in their area of competence. It is also used to ensure compliance with Italian and European laws by producing all the required reports related to MSW management. The system is currently adopted in a large part of the south of Italy (in almost all the municipalities of the Campania and Calabria regions and in the majority of those of the Puglia region). The scientific literature highlights the crucial role of high-quality data to develop reliable life-cycle assessment (LCA) studies, particularly in the waste-management sector [1; 2; 3]. Data contained in the W-MySir platform appear particularly suitable to support this kind of study, which the European Union considers to be the best way to quantitatively assess the environmental performance of a good or service [4]. W-MySir provides certified data about amounts gathered by municipal waste streams, the related percentages for separate collection, the number of journeys specifically made for each EWC, together with other information related to the transport (e.g., distance covered, type of vehicle, its identification, shipping certificate, company name) and destination (e.g., location, type of treatment). These data can also be used as a reliable basis to assess, from a life-cycle perspective, the performances of different MSW management scenarios related to different areas in a specific time, or to the same area at different time intervals. In other words, data obtainable from W-MySir, when properly processed, can be combined with the LCA procedure to provide a comprehensive understanding of an existing waste-management system, and to identify possible areas for further improvement. If the focus is on a specific municipality, data related to different years can also be used to analyse the evolution of the WM system, to quantify its environmental performances, and to evaluate whether the adopted criteria have produced the expected results. Figure 1 schematically describes the flow of data between the W-MySir platform and the proposed LCA case study, which refers to municipal solid waste management in 2011 and 2021 in the municipality of the island of Procida, one of the three islands (together with Ischia and Capri) of Naples Bay. An example of the data types that can be provided by the information system is reported in the tables and diagrams of ANNEX A. The proposed case study represents a typical application of LCA in integrated waste management, which [PERSON] et al.