## 3 Methodology
* **Multi-national large provider of IT products and services--offering a variety of hardware and software products together with software and related services including consulting, cloud services, and hosting--Cybersecurity Manager (in middle management of service operations) as respondent. To analyze the feedback and verifications collected during the evaluation interviews, a table and pattern matching [31] were used. The collected feedback and verifications have been shared and verified with the interviewees to ensure correctness and accuracy, which increases the validity of the research further. Finally, the feedback from the evaluations was then used to improve the draft initial model into the final initial one (see Figure 1), which was also reviewed by the interviewees after the interviews. Extending Product Lifecycles--An Initial Model Using New and Emerging Existential Design Aspects for Long and Extendable Lifecycles  
The initial model in Figure 1, regarding extending product lifecycles to achieve long and extendable lifecycles in the light of new and emerging existential design aspects, is based on insights from the participatory research and the following literature:  
* Design methods and lifecycle models for circularity [2; 3; 4; 5; 6; 10; 18; 19]. * Practical problems concerning for instance stressed value chains/networks and related issues regarding sourcing, shipping, and logistics [14; 15; 21]. * Applicable design-for-Xs and additional existential design aspects including cybersecurity for long, sustainable, and secure lifecycles [1; 6; 7; 8; 9; 21; 22]. The initial model draws on ideas regarding design methods and lifecycle models for circularity with long and extendable lifecycles including disassembly and reverse logistics [2; 3; 4; 5; 6; 10; 18; 19]. Further, the number of design aspects [1; 5; 6; 7; 8], whereof some may need to be translated into requirements, may require some loops between requirements engineering and design to form the set of requirements and following design into an integrated design. Some of this may be possible to solve by iterations in agile settings; however, if there are holistic design aspects, this can have a great impact on software and hardware architectures as well as on the selection of available raw materials, components, open-source software/frameworks, etc. Further, to be able to test adequately, the requirements and design aspects need to be properly documented and communicated regarding quality assurance, documentation, support, continuing engineering teams, etc., or else there is a risk of poor quality or untested parts of the products. In addition, if the availability of key raw materials, components, external software, etc., varies and is unreliable, stocking up or other measures may be required to keep the installed and commissioned products operating at the agreed-upon level with customers. However, stocks bind capital, and, in general, stock levels are kept as low as possible depending on the expected average time to refill, for instance, raw materials and components. The recent major problems in value chains/networks [14; 15] may lead to changes lessening the need for long transport through dangerous or adventurous passages as well as avoiding production or transit in countries with non-democratic ruling. To achieve increased sustainability, profitability, and competitiveness, the proposed solution is to plan for and implement advanced cybersecure fleet management functionality to improve the efficiency of operations, enable the monitoring of digital/connected products, and lessen the need for physical visits to support and maintain software or services while hardware service, maintenance, or repairs may still require a physical presence on-site [9; 21; 22]. The fleet management functionality may cover:  
* **Installation, configuration, and commissioning phase--**support installations of software, set up, and initial configuration (potentially using secure plug-and-play, including pre-decided configurations fetched when and where appropriate).