20.1.2. Key Business Requirements

• Users can add multiple products to the cart
• Cart contents are saved across sessions
• Discounts and promo codes can be applied
• Cart updates dynamically with stock availability
• Checkout process integrates with payment gateway

This chunk outlines the key business requirements for an e-commerce cart system. First, users have to have the option to add multiple products to their shopping cart, which allows for a better shopping experience. Secondly, the system must remember what users added to their cart even if they log out and return later; this is known as session persistence. Additionally, users should be able to apply discounts or promo codes at checkout, incentivizing purchases. The cart must also reflect the current stock availability in real-time to prevent customer disappointment. Lastly, the checkout process needs to seamlessly integrate with a payment gateway to process payments efficiently.

Think of online shopping like a brick-and-mortar store. In a physical store, when you fill your cart with items and then go to the register, the cashier needs to know what items you want to purchase, and they confirm that those items are indeed available. If you could bring your cart back the next day without losing what you selected, that would be like the system saving your cart across sessions. Applying discounts in-store is like giving a coupon to the cashier; it should deduct from your total before you pay.

• Patients can search doctors by specialty, location, availability
• Doctors can accept or reject appointment requests
• Automatic SMS/email reminders before appointments
• Admin dashboard for scheduling rules and blackout dates

This chunk lists the essential business requirements for a healthcare appointment system. Patients should be able to search for doctors based on specialty, location, and availability, making it easier for them to find a suitable healthcare provider. Doctors must have the ability to accept or reject appointment requests to manage their schedules effectively. Automatic notifications via SMS or email are important for reminding patients about their upcoming appointments, reducing no-show rates. Lastly, an admin dashboard is crucial for managers to set scheduling rules and identify any blackout dates when doctors are unavailable.

Consider how you schedule a meeting in a busy office. You need to know who is available, their expertise, and if they can join the meeting on the proposed date. If someone sends you a calendar invite but forgets to confirm, it’s like a doctor accepting an appointment request. Getting reminders about the meeting is like the automated alerts sent to patients about their appointments.

• Users can apply for a loan with ID and income documents
• System auto-calculates eligibility based on rules
• Risk engine flags high-risk applications
• Integration with credit bureaus (e.g., CIBIL)
• Application tracking via dashboard

This chunk discusses the business requirements for a banking loan application system. Users should be able to apply for loans by providing valid ID and income documentation. The system should automatically determine if the user is eligible for a loan based on predefined criteria. Additionally, a risk engine is required to identify and flag applications that are high risk. To verify the borrower's creditworthiness, the system needs integration with credit bureaus. Finally, an application tracking feature must be available on a dashboard for users to see the status of their loan applications.

When you apply for a loan at a bank, you fill out forms and provide proof of income, similar to submitting your documents in the loan application system. The bank has criteria they use to decide if you qualify, like minimum income requirements or credit history checks. If you have a history of missed payments, that could raise a red flag; that's what the risk engine does. Tracking your application's progress online is like checking your email for updates about your loan status.

--