Edexcel 1CP2, mapped to Coding Pathway Worksheets and Workspace lessons

Why a computer counts in twos, converting between binary and denary, adding binary numbers, and what happens when the answer does not fit.

Representing negative numbers, multiplying and dividing by shifting, hexadecimal as a shorthand for binary, and how characters are stored.

What is actually happening inside the processor, the cycle it repeats, and where data lives when the power is off.

The jobs an operating system does that nobody sees, and the tools that keep a machine working.

How systems are attacked, including the attacks that target people rather than machines, and what a school or business does about it.

Local and wide area networks, what the internet is made of, what makes a network fast or slow, and how machines are wired together.

Computers inside other things, devices that talk to each other, and how a message actually crosses a network.

What computing costs the planet, the difference between high and low level languages, and how source code becomes something a processor can run.

How a picture and a sound become numbers, working out how big the file will be, and what compression trades away.

Machine learning and robotics, what happens to personal data, and the legislation that governs it.

The first programs: breaking a problem down, deciding what a program needs to remember, reading input, and finding the fault when a short program does not do what it says.

Working with text, choosing between paths with relational and Boolean operators, and repeating until a condition is met rather than a fixed number of times.

Storing many values in one structure, walking through them a known number of times, and moving repeated work into procedures and functions of your own.

Formatting output for a reader, holding a table of values rather than a list, keeping bad input out, and finding a value by looking at each item in turn.

Sorting by dividing and merging, reading and writing files that outlive the program, taking strings apart, and checking who is asking.

Applying everything so far to drawing: movement and coordinates, reusable shapes, pen and fill, and composing a scene from subprograms. Turtle commands are the vehicle here, not the subject. Most of this topic is Workspace lessons, where students write and run real drawing programs and a teacher can see both the code and the picture it made; the two Worksheets sit inside that sequence for reading, planning and debugging.

Coming back to programming after a break: what a subprogram can and cannot see, and using code someone else wrote.

Following a program by hand, naming the kind of error in front of you, and the two algorithms most often asked for in the exam.

A second, harder pass over data types, strings and lists, with tracing and error-finding on longer programs than before.

Consolidation for the exam: tables of data, well-chosen subprograms, and testing a program properly rather than running it once.