Creating an event driven computer program using Visual Basic
This unit focuses on creating event-driven programs using Visual Basic, covering implementation, refinement, testing, and documentation. Learners apply software design principles to build interactive applications with user interfaces and event handlers.
Assessment criteria
Topic Overview
The City & Guilds Level 4 Diploma for ICT Professionals (Systems and Principles) is a comprehensive vocational qualification designed to equip students with the advanced knowledge and practical skills required for a career in ICT. This diploma covers a wide range of topics, including systems analysis, database design, network infrastructure, cybersecurity, and project management. It is structured to provide a deep understanding of how ICT systems are designed, implemented, and maintained in real-world business environments.
This qualification is particularly valuable because it bridges the gap between theoretical computer science concepts and hands-on professional practice. Students will learn to apply systems thinking to solve complex problems, manage ICT projects effectively, and ensure that systems are secure and reliable. The diploma is recognised by employers and professional bodies, making it a strong foundation for roles such as IT consultant, systems analyst, network engineer, or project manager.
Within the broader context of ICT, this diploma emphasises the integration of hardware, software, and human factors. It prepares students to work with current technologies while also understanding the principles that underpin future innovations. By the end of the course, students will be able to critically evaluate ICT systems, propose improvements, and communicate technical concepts to non-specialist stakeholders.
Key Concepts
Core ideas you must understand for this topic
- →Systems Development Life Cycle (SDLC): Understand the phases from feasibility study to maintenance, including methodologies like Waterfall and Agile.
- →Database Design and Normalisation: Master entity-relationship modelling, normal forms (1NF, 2NF, 3NF), and SQL for data manipulation and querying.
- →Network Architecture and Protocols: Learn about OSI and TCP/IP models, routing, switching, and common protocols such as HTTP, FTP, and DNS.
- →Cybersecurity Principles: Grasp the CIA triad (Confidentiality, Integrity, Availability), threat modelling, encryption, and access control mechanisms.
- →Project Management Techniques: Apply PRINCE2 or PMBOK frameworks, including risk management, resource allocation, and Gantt charting.
Learning Objectives
What you need to know and understand
- Implement a software design using event driven programming, Refine an event driven program to improve quality, Test the operation of an event driven program, Document an event driven program
Assessment Criteria
Key criteria assessors look for in your portfolio
- Implements a software design using event-driven programming techniques.
- Refines the program to improve quality, such as efficiency or usability.
- Tests the program systematically, identifying and fixing errors.
- Documents the program clearly, including code comments and user guides.
Assessment Guidance
Guidance for achieving higher grades
- 💡Use meaningful variable names and consistent indentation for readability.
- 💡Include error handling routines like Try-Catch blocks.
- 💡Test each event handler individually before integrating.
- 💡When answering questions about system design, always justify your choices with reference to requirements, constraints, and trade-offs. Examiners award marks for clear reasoning, not just correct answers.
- 💡For network questions, draw diagrams to illustrate topologies or data flow. Visual representations can clarify your understanding and help you avoid missing key components like firewalls or switches.
- 💡In project management scenarios, explicitly mention how you would handle risks and changes. Use specific tools (e.g., RAID log, change control board) to demonstrate practical knowledge.
Common Mistakes
Common errors to avoid in your coursework
- Neglecting to handle all possible user input errors or edge cases.
- Poorly structured event handlers leading to code duplication.
- Insufficient testing, especially for boundary conditions and unexpected events.
- Misconception: The SDLC must always follow a strict linear sequence. Correction: While the Waterfall model is linear, Agile methodologies allow iterative development, and real projects often blend approaches.
- Misconception: Normalisation always improves database performance. Correction: Over-normalisation can lead to excessive joins, slowing queries. Denormalisation may be used for read-heavy systems.
- Misconception: Cybersecurity is solely about technology. Correction: Human factors (e.g., social engineering, user training) are equally critical; a robust security policy addresses people, processes, and technology.
Frequently Asked Questions
Common questions students ask about this topic
Pass / Merit / Distinction Evidence Checklist
How your portfolio evidence is graded for CITY & GUILDS LIMITED Creating an event driven computer program using Visual Basic
Every vocational unit is marked against named criteria rather than an exam percentage. Your tutor's brief lists the exact codes for this unit — here is what each band is asking you to do.
Demonstrate baseline knowledge, accurate terminology, and core practical application.
Provide detailed analysis, structured explanations, and clear workplace reasoning.
Deliver thorough evaluation, original problem solving, and fully justified recommendations.
Before You Start
Prior knowledge that will help with this topic
- •Basic understanding of computer hardware and software components.
- •Familiarity with fundamental networking concepts (e.g., IP addressing, LAN/WAN).
- •Introductory programming knowledge (e.g., variables, loops, functions) is helpful but not mandatory.
Coursework AI Review
Paste your assignment brief and check your draft against its P/M/D criteria
Key Terminology
Essential terms to know
- Implement a software design using event driven programming, Refine an event driven program to improve quality, Test the operation of an event driven program, Document an event driven program
Ready to learn?
AI-powered learning tailored to this unit