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System Security

The first video introduces the variety of threats to system security.  Malware, phishing, brute force attacks, denial of service, data interception/theft and SQL injection are all considered and explained.  Simple notes on each of these are presented toward the end of the video.

The second video explores...

Network Topologies – Protocols and Layers

The first video examines the topology of modern networks – how the computers are arranged and connected together.  The history of network topologies is outlined briefly, before considering star networks in more detail.  The need for, and the advantages of a central switch, together with the concept of mesh and...

Wired and Wireless Networks

The first video explores the two main types of networks: local area networks (LAN) and wide area networks (WAN).  The reasons for networking stand-alone computers are outlined, and the potential disadvantages too.  The connection options for devices on a network are briefly mentioned and covered in more detail in...


The first video explains why a computer needs secondary storage, and explains what is meant by primary and tertiary storage.

The second video explains what is meant by the term “capacity” of storage devices.  The relative size of different types of files is introduced.  (More detailed explanations of this...

Systems Architecture

The first video explores the first computers that had stored programs in the same memory space as the data required for them.  This is known as the von Neumann architecture and is still the foundation principle on which most computers are still built today.  We take the lid off a central processing unit and explain...


The first video explores the purpose of both RAM and ROM in a typical computer system.  The differences between the two memory types are outlined.

The second video considers what happens when a modern multi-tasking operating system runs out of physical RAM.  Does it output a “memory full” message and refuse...

Java programming with Greenfoot: introduction

This video tutorial provides students with an overview of Greenfoot Java.  It demonstrates several different game ideas and introduces the layout of the programming environment.

More resources can be found here

Java programming with Greenfoot: viewer questions (timers)

This video tutorial considers how to arrange for something to happen after a specific time delay.  It covers the difference between real time and game time; the latter depends upon the program’s frame rate, which can be quickly altered by the speed setting within the game.  Expressing changes in real time is...

Java programming with Greenfoot: refactoring for good style (teacher commentary)

This video explains good coding behaviour.  This includes an emphasis on refactoring (changing code to make its structure better so that it can later be easily changed or understood) and cohesion (ensuring that each method does only one thing).  It also explains that private methods will only apply to objects in...

Java programming with Greenfoot: more loopiness

In this video tutorial students are guided through programming a nested loop to create multiple rows of blocks within their breakout game.  Different ways of achieving this are assessed and implemented.

More resources can be found here


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