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Component Diagram Examples — 25+ Free UML Component Diagrams for BSIT Capstones (2026)

itsourcecode.com hosts 25+ free Component Diagram examples for BSIT capstone projects (2026) — complete UML component diagrams showing system architecture, software components, and their interfaces for the most common capstone domains. Capstone-ready for Chapter 3 documentation.

What is a Component Diagram?

A Component Diagram is a UML structural diagram that shows how a system is divided into components — the high-level building blocks of your software architecture. Components communicate via interfaces (the “lollipop” notation: provided interface = circle, required interface = half-circle). Components can be: Business Logic (Order Processor, Authentication Module), UI (Login Page, Dashboard), Data Access (Database Connector, File Handler), or External Services (Payment Gateway, SMS API). Component diagrams answer “what are the major pieces of my system and how do they connect?”

When to use a Component Diagram in capstone

  • Your system has 5+ major modules that need clear separation
  • You are using a layered architecture (UI / Business Logic / Data Access)
  • You integrate with external services (Payment, SMS, Cloud Storage)
  • Your panel asks “what is your system architecture?” — Component diagram answers it

Featured Component diagrams by system domain

🎓 School, Student & Library

🏥 Hospital & Blood Bank

🍽️ Hotel, Restaurant & Event

🛒 E-commerce, Shop & Inventory

🏦 ATM, Banking & Payroll

🚗 Transport, Travel & Reservation

🔐 Authentication & AI

About this Component diagram collection

Curated since 2015 by PIES Information Technology Solutions, Binalbagan, Negros Occidental, Philippines. Used by 12,000+ BSIT students monthly. Pair each Component diagram with the matching Deployment Diagram for full system architecture documentation in Chapter 3.

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Component Diagram for Payroll Management System The component diagram for payroll management system is used to show how the system’s parts work together to make the desired payroll operate correctly. …

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Frequently Asked Questions

What is a Component Diagram?
A Component Diagram is a UML structural diagram showing how a system is divided into software components — the major building blocks of your architecture. Components communicate via interfaces (the "lollipop" notation — provided interface is a circle, required interface is a half-circle). Components can be business logic modules, UI layers, data access layers, or external services like payment gateways.
What is the difference between Component Diagram and Class Diagram?
Class Diagram is fine-grained — individual classes with attributes and methods. Component Diagram is coarse-grained — groups of related classes packaged as deployable units (e.g., "Authentication Module" contains multiple Java classes). Use Class Diagram for code-level documentation; use Component Diagram for architectural overview.
What is the difference between Component Diagram and Deployment Diagram?
Component Diagram shows WHAT software components exist and how they connect logically. Deployment Diagram shows WHERE each component physically runs (which server, laptop, mobile device). Most capstones with web/cloud deployment include BOTH: Component for logical architecture, Deployment for physical topology.
When should I include a Component Diagram in my capstone?
Include when: (1) Your system has 5+ major modules that need clear separation. (2) You use a layered architecture (Presentation / Business Logic / Data Access). (3) You integrate with external services (Payment Gateway, SMS API, Cloud Storage). (4) Your panel asks "what is your system architecture?" Skip for trivial single-file scripts or basic CRUD apps with no external integration.
What are provided and required interfaces?
A provided interface (drawn as a circle/lollipop on the component) is functionality the component OFFERS to others (e.g., the Authentication Module provides an "authenticate(user, pass)" interface). A required interface (drawn as a half-circle/socket) is functionality the component NEEDS from another (e.g., Authentication requires a "userRepository" interface that the Data Access Layer provides). When a lollipop fits into a socket, the components are connected.
What free tool should I use to draw a Component Diagram?
draw.io / diagrams.net — free, web-based, has UML Component shapes (lollipop, socket, component rectangle). Visual Paradigm Community — full UML support with auto-layout. PlantUML — text-based, fast iteration. Lucidchart Free — limited free tier. Pick draw.io for capstone speed.
How often is this Component Diagram collection updated?
New Component Diagrams are added regularly. Existing diagrams are revised when UML 2.5.x notation updates. Last refreshed: May 2026.

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