Appendix: Company Descriptions:

Company $1$: Zenith Electronics:

Zenith Electronics is a leading global retailer specializing in consumer electronics, offering a wide range of products from smartphones and laptops to home appliances and audio$-$visual equipment. With its headquarters in Silicon Valley, USA, Zenith Electronics operates both physical stores and an e$-$commerce platform, serving millions of customers worldwide. The company prides itself on its exceptional customer service, competitive pricing, and a seamless shopping experience.

Transaction Processing System $($TPS$)$ at Zenith Electronics

Zenith Electronics utilizes a sophisticated Transaction Processing System to manage its vast number of daily transactions efficiently. The TPS is integral to both in$-$store purchases and online sales, handling tasks such as payment processing, inventory management, order tracking, and customer data management. TPS includes Point of Sale $($POS$)$ Systems for in$-$store transactions, E$-$commerce Platform for online sales; and Inventory Management System to update stock levels in real$-$time, ensuring accurate inventory data.

Company $2$: Green GrocerCo.

GreenGrocer Co$.$ is a mid$-$sized, environmentally conscious grocery chain that operates in the urban and suburban areas of the Northeast United States. The company focuses on providing fresh, organic produce, sustainable and locally sourced products, and a range of health and wellness items to its customers. GreenGrocer Co$.$ has successfully established a network of $30$ stores and also operates a robust online platform for home deliveries and pickup services.

Transaction Processing System $($TPS$)$ Overview:

GreenGrocer Co$.\text{'}$s Transaction Processing System is a cornerstone of its daily operations, enabling efficient and accurate processing of thousands of transactions across its physical stores and online platform. The TPS is designed to handle various transactions, including sales, returns, inventory restocking, and customer loyalty programs. The TPS includes: Point of Sale $($POS$)$ Systems, E$-$Commerce Platform, Inventory Management System, and Customer Relationship Management System.

Company $3$: MetroBank

MetroBank Financial is a dynamic, regional bank that serves a diverse clientele in the Pacific Northwest. Offering a wide range of financial services, including personal banking, business banking, mortgages, and investment services, MetroBank Financial prides itself on its customer$-$centric approach, leveraging technology to enhance service delivery and operational efficiency. With a network of $50$ branches and a comprehensive digital banking platform, MetroBank Financial is committed to meeting the evolving needs of its customers.

Transaction Processing System $($TPS$)$ Overview:

The backbone of MetroBank Financial's operations is its advanced Transaction Processing System, designed to handle a vast array of financial transactions securely and efficiently. The TPS supports both the core banking functions and the digital banking needs of the bank's clientele. TPS systems include: Core Banking System to manage all the fundamental banking operations; Digital Banking Platform for online and mobile banking; and Automated Teller Machines $($ATMs$)$