Know and understand identifying and justifying suitable hardware and software for the new system

7 The Systems Life Cycle

What is a Systems Life Cycle?

A step‑by‑step journey that takes a project from an idea to a fully working system. Think of it as a recipe: you start with ingredients (requirements), mix them (design), bake (implementation), taste (testing), and finally serve (deployment & maintenance). 🧩

Key Stages

1. Planning – Decide what the system should do and who will use it.
2. Analysis – Gather detailed requirements and constraints.
3. Design – Create the architecture and choose hardware/software.
4. Implementation – Build and configure the system.
5. Testing – Verify that everything works as expected.
6. Deployment – Release the system to users.
7. Maintenance – Keep the system running and improve it over time.

Choosing Hardware & Software

When picking hardware (like a computer or server) and software (applications, operating systems), you need to match them to the system’s needs and budget. It’s similar to selecting the right bike for a trip: a mountain bike is great for rough trails but not for a quick city ride. 🚴‍♂️

Factors to Consider

• Performance – CPU speed, RAM, storage type.
• Compatibility – Does the software run on the chosen OS?
• Scalability – Can the hardware grow with more users?
• Reliability – Redundancy, backup options.
• Cost – Initial purchase + ongoing maintenance.
• Security – Encryption, access controls.

Example Decision Matrix

Cost Formula (Illustrative)

$ \text{Total Cost} = \sum_{i=1}^{n} (\text{Hardware}_i + \text{Software}_i) $

Exam Tip Boxes

Quick Summary

• Follow the life cycle stages to keep projects organised.
• Match hardware/software to performance, compatibility, cost, and future needs.
• Use clear analogies and a decision matrix to explain your choices.
• Always include a brief cost estimate and justification for each decision.