Waterfall vs Agile: Comparative Analysis and Scrum Process Overview

Waterfall model is a traditional development approach commonly used in B2B systems such as ERP, MES, WMS, CRM, OA, and IBMS, characterized by clear sequential phases, milestone focus, extensive documentation, and strict role separation, but suffers from inflexibility, high change cost, and long cycles.

Advantages

Clear phases from planning to development and deployment.

Strict time order; each stage follows the previous one.

Each phase produces deliverables before moving on.

Black‑box mode: roles focus on their own tasks.

Disadvantages

Requirement isolation leads to uneven understanding of customer needs.

High cost of changes; returning to previous phases is difficult.

Constrains creativity due to heavy documentation focus.

Long development cycles, often six months to a year, suitable only for stable large projects.

Agile Development Background

Agile emerged with the internet wave, driven by consumer‑oriented (2C) products where core features are delivered first (e.g., WeChat’s chat before wallets or mini‑programs). It emphasizes focus, excellence, reputation, and speed.

Scrum Overview

Scrum, a term from rugby meaning “to contest the ball,” is a concrete Agile framework that improves development efficiency through defined roles and ceremonies.

Scrum Roles

Product Owner: Provides the overall product backlog, defines boundaries, prioritizes features, and can reject deliverables.

Development Team: Self‑manages, actively communicates, and estimates work.

Scrum Master (Process Administrator): Removes impediments, facilitates collaboration, and can reject scope changes.

Scrum Process

1. Create a product backlog (Product Owner). 2. Development team estimates and plans work. 3. Select a story for the sprint (1‑4 weeks) and break it into a minimal product increment. 4. Further split the story into tasks that can be completed within two days. 5. Conduct daily stand‑up meetings (≈15 minutes) covering what was done yesterday, today’s plan, and blockers. 6. Update the sprint burndown chart on the board after each stand‑up. 7. Perform daily integration to maintain a build that can be demonstrated. 8. At sprint end, hold a demo (review) meeting with the Product Owner and stakeholders. 9. Conduct a retrospective to discuss improvements for the next sprint.

Comparison Overview

Waterfall emphasizes documentation and milestone planning, while Agile (Scrum) focuses on people, collaboration, and rapid feedback. Both have boundaries; teams need a shared understanding to avoid inefficiencies.

Key Takeaways

Choosing between Waterfall and Agile depends on project size, stability of requirements, and team composition. Hybrid approaches often work best, and successful adoption requires experienced managers, clear communication, and consensus across the organization.