Activity Diagram for E-Commerce Checkout (Complete Example)
Activity Diagram for Ecommerce capstones live or die by the checkout flow. Most students draw a simple linear “add to cart → pay → done” diagram that doesn’t reflect any …
UML Diagrams Library: 300+ Free Examples for BSIT Capstone Projects (2026)
itsourcecode.com hosts 300+ free UML diagrams for BSIT capstone and final-year projects: ER diagrams, Data Flow Diagrams (DFD), Class Diagrams, Use Case, Activity, Sequence, Component, and Deployment diagrams for common systems like Library Management, Hospital, Hotel, Restaurant, School, ATM, Payroll, E-commerce, and more. Every diagram is downloadable, editable, and free for academic use. Browse by diagram type below, or jump directly to a complete UML set for your specific capstone system.
Why UML diagrams matter for your capstone defense
UML (Unified Modeling Language) diagrams are required documentation for almost every BSIT capstone and thesis defense in 2026. Your panel will ask to see at least four: a use case diagram (what the system does), an ER diagram or class diagram (what data it manages), an activity or sequence diagram (how the workflow runs), and a deployment diagram (how it’s hosted). Submitting a project without these is the single most common reason panels reject documentation on first review.
How to choose the right UML diagram for your project
Start with these four, in this order, they cover ~90% of capstone requirements:
Use Case Diagram: Shows actors (admin, customer, staff) and what each can do. Build this first. It defines your scope.
ER Diagram (Entity Relationship): Shows your database tables and how they relate. Build this second, before writing code.
Activity Diagram: Shows the step-by-step flow of a specific feature (e.g., “borrow a book”, “place an order”). Build one per major use case.
Class Diagram: Shows the object-oriented structure of your code. Build this once your architecture is locked.
If your defense panel asks for “sequence” or “component” diagrams, you’ll find those below too. Most BSIT programs require 4-8 UML diagrams total per thesis.
Featured UML diagrams by type
📐 Use Case Diagrams (43 examples)
Shows who can do what. Required for almost every BSIT capstone.
Library Management System, Use Case Diagram
Hotel Management System, Use Case Diagram
Hotel Reservation System, Use Case Diagram (2026)
Online Shopping System, Use Case Diagram
Online Shopping Cart, Use Case Diagram (2026)
→ Browse all 43 Use Case Diagrams
🗂️ ER Diagrams: Entity Relationship (38 examples)
Shows your database structure. Required before coding starts.
College Library Management System, ER Diagram
School Management System, ER Diagram (Complete Database Design)
ATM Management System, ER Diagram
→ Browse all 38 ER Diagrams
🔀 Data Flow Diagrams: DFD (42 examples)
Shows how data moves through your system at Level 0, 1, and 2.
DFD for Library Management System, Levels 0, 1, 2
DFD for Restaurant Management System (Complete Guide)
DFD for Hotel Reservation System, Levels 0, 1, 2
DFD for Online Shopping System
DFD for Online Shopping Cart
DFD for E-Commerce Website
DFD for Hospital Management System, All Levels
→ Browse all 42 Data Flow Diagrams
🏛️ Class Diagrams (100+ examples)
Shows your object-oriented code structure. Includes Java and PHP class examples.
Library Management System, Class Diagram (Java + PHP)
Hotel Management System, Class Diagram
Hospital Management System, Class Diagram (Java + PHP)
School Management System, Class Diagram
Restaurant Management System, Class Diagram
⚡ Activity Diagrams (33 examples)
Shows the step-by-step flow of a specific feature or process.
Library Management System, Activity Diagram
ATM Management System, Activity Diagram
Hospital Management System, Activity Diagram (2026)
Login & Registration, Activity Diagram
→ Browse all 33 Activity Diagrams
🔁 Sequence Diagrams (35 examples)
Shows the time-ordered interactions between actors and the system.
Library Management System, Sequence Diagram
Hotel Management System, Sequence Diagram
Hotel Reservation System, Sequence Diagram (2026)
Hospital Management System, Sequence Diagram
Online Shopping System, Sequence Diagram
E-Commerce Website, Sequence Diagram
→ Browse all 35 Sequence Diagrams
🧩 Component & Deployment Diagrams
Shows the physical structure of your system (servers, libraries, modules).
Component Diagram, Library Management
Deployment Diagram, Library Management
Component Diagram, Hospital Management
Deployment Diagram, Hospital Management
Component Diagram, Railway Reservation
Component Diagram, Airline Reservation
Complete UML diagram sets by system
If you’ve picked your capstone system, jump straight to a complete UML set, each page below contains multiple diagrams (Use Case + DFD + Class + ER + Sequence + Activity) for one system, organized for your defense documentation.
Library Management System: Complete UML Set (DFD + Class + Use Case + 6 more)
Hospital Management System: Complete UML Set (Class + DFD + Activity + Component + Sequence)
Hotel Management System: Complete UML Set (DFD + Class + Use Case)
Restaurant Management System: Complete UML Set (DFD + Class)
E-Commerce Website: Complete UML Set (Class + Use Case + Sequence)
Online Shopping System: Complete UML Set
Student Enrollment System: Complete UML Set (DFD + Class + Use Case)
Credit Card Processing System: Complete UML Set (Class + Sequence + DFD)
Face Recognition Attendance System: Complete UML Set
About this UML diagrams collection
This UML diagrams library has been curated since 2015 by PIES Information Technology Solutions, a software services company based in Binalbagan, Negros Occidental, Philippines. The collection is used by 12,000+ BSIT students monthly across the Philippines, India, and the United States for capstone, thesis, and coursework documentation. If you’ve found a specific diagram useful for your defense, or you need a UML diagram for a system we don’t yet cover, leave a comment on the related post or contact us via the site footer.
Sequence Diagram for Online Banking System (Step-by-Step)
Online Banking is one of the few BSIT capstone topics where panels actually scrutinize the sequence diagram. For an Inventory or Library project, the sequence diagram is filler. For a …
ER Diagram for Hospital Management System (with SQL Schema)
Hospital Management System is a top-5 BSIT capstone topic in 2026, and the ER diagram is where your database design becomes defensible. Without a strong ER diagram in Chapter 3, …
DFD for Inventory Management System (Levels 0, 1, 2 with Diagrams)
Inventory Management System DFD Levels 0, 1, 2 is the single most common BSIT capstone topic in 2026. Cafeteria inventory, drugstore inventory, sari-sari store inventory, warehouse inventory. at least one …
DFD for Restaurant Management System 2026: Complete Data Flow Diagram Guide
If you are working on a capstone project for your BSIT course in 2026 and need a Data Flow Diagram (DFD) for Restaurant Management Systemthis guide gives you everything: the …
Student Course Registration System Class Diagram 2026: Complete UML [Java + PHP Code]
The student course registration system class diagram is an illustration of the Unified Modeling Language’s (UML) class relationships and source code dependencies. Its class describes the methods and variables of …
School Management System Class Diagram
The Class Diagram for School Management System is a designed structure that shows the classes and their relationships. This diagram is made to guide programmers along with the School management …
Component Diagram for Railway Reservation System | UML
The Component Diagram for Railway Reservation System is a diagram used to show how the parts of the railway reservation system work together to make the system run efficiently. In …
Class Diagram for Restaurant Management System
The UML class diagram for restaurant management system is a structure that shows how the system’s classes relate to each other. This UML Class Diagram is made to help programmers …
Class Diagram for Employee Payroll System
The class diagram for the Employee Payroll System is a designed structure that shows the management system classes and their relationships. This UML Class Diagram is made to guide programmers along …
Class Diagram for Airline Reservation System
The class diagram airline reservation system is a designed illustration to show the projects’ classes, relationships, and classes. This UML Class Diagram is made to guide programmers along with the …
Class Diagram for Online Railway Reservation System
The Online Railway Reservation System Class Diagram is a designed illustration of the system’s attributes and classes. The illustration shows how the classes were used and plotted in the system. …
Class Diagram for Order Processing System
The Order Processing System Class Diagram is a planned structure of the system that shows the system’s classes and how they relate to each other. This UML class diagram is …
Frequently Asked Questions
What is UML and why do BSIT capstone projects need it?
UML (Unified Modeling Language) is a standard set of diagrams used to visualize, design, and document software systems before you write code. For BSIT capstones, UML is required because your defense panel needs to verify that you actually designed the system, not just downloaded code. Chapter 3 (Methodology) of every Philippine BSIT capstone manuscript expects at minimum a Use Case Diagram, a Class Diagram, and either a DFD or an ER Diagram. Panels also use UML to test whether you understand your own system: if you cannot explain your own diagram in defense, that is an automatic red flag.
Which UML diagrams are required for a BSIT capstone in 2026?
The standard set most Philippine panels expect is: Use Case Diagram (who can do what), Class Diagram (system entities and their relationships), Sequence Diagram (how a key transaction flows over time), Activity Diagram (the workflow for one major process), and either a DFD (Data Flow Diagram) or an ER Diagram (database schema). For larger systems you can also add a Component Diagram and a Deployment Diagram. Stick to 4-5 well-explained diagrams rather than 10 you cannot defend.
What is the difference between UML and DFD (Data Flow Diagram)?
UML is the umbrella standard, which includes 14 diagram types (Class, Use Case, Sequence, Activity, Component, etc.). DFD is a separate, older notation that predates UML and focuses specifically on how data moves between processes, data stores, and external entities. Most BSIT panels accept both because DFD shows the data flow story cleanly, while UML Use Case and Class diagrams show the structural story. The safest approach for capstone is to include one DFD (Level 0 plus Level 1) AND a UML Class Diagram. Browse our UML Diagrams Library for examples of both.
What software should I use to draw UML diagrams?
For BSIT capstone work in 2026 the top three free options are draw.io (now diagrams.net, browser-based, no signup, exports clean PNG and PDF), Lucidchart (web-based, free tier supports 60 shapes per diagram which is enough for capstone), and StarUML (desktop, generates real UML syntax and can reverse-engineer existing code). Avoid Microsoft Visio unless your school provides a license. PlantUML is great if you prefer text-based diagram generation. Whatever you pick, export the final image as high-resolution PNG and embed it in your manuscript at full page width.
Can I copy the UML diagrams on itsourcecode.com for my capstone?
You can use our diagrams as a reference and starting point, but you should not paste them unchanged into your manuscript. Adapt every diagram to your specific system: rename the actors to match your stakeholders, replace the class names with your real entities, add the attributes your database actually uses, and remove anything that does not apply. A panel that recognizes a verbatim itsourcecode.com diagram will mark you down for originality. Treat our library as your structural template, not your finished work.
Where do UML diagrams go in the capstone Chapter 1-5 manuscript?
Most Philippine BSIT capstones place UML diagrams inside Chapter 3 (Methodology) under a "System Design" or "Conceptual Framework" section. The typical order is: Use Case Diagram first (defines scope), then Class Diagram or ER Diagram (defines the data), then Sequence and Activity diagrams (defines behavior), then optional Component or Deployment diagrams (defines architecture). Each diagram should have a figure caption (Figure 3.1, 3.2, etc.) and at least one paragraph explaining what the panel is looking at. See our full capstone writing series for chapter-by-chapter templates.
Do you have source code that matches these UML diagrams?
Yes. Most of our UML pages now include a "Working source code that implements this diagram" section near the bottom, with downloadable projects in PHP, Java, ASP.NET, VB.NET, Python, Django, Laravel, and CodeIgniter for the same system. Browse our Free Projects hub if you need to start from the code side and work backward to the diagram. The pairing of "diagram + working source code" is the strongest evidence you can show your panel that your design and implementation match.