SS 1 First Term

Lesson objectives

By the end of the week, learners should be able to:

1. Define a programming language as a set of instructions.
2. Name three programming concepts: variables, loops and selection.
3. Explain why high-level languages are easier than assembly.
4. Describe the role of an interpreter.
5. Trace one simple interpreter program to predict output.

Key vocabulary

• Programming language: a structured notation telling the computer what to do.
• Variable: a named container holding a value.
• Loop: a repeatable block of instructions.
• Selection: a branch such as if-then that runs different paths.
• High-level language: a language closer to human speech than machine code.
• Assembly language: a low-level language mapping closely to machine code.
• Interpreter: a program that executes high-level commands line by line.
• Machine code: binary instructions executed directly by hardware.
• Trace: predicting output by stepping through code.

Common misconceptions

• "Programming is only for geniuses." Programming is a craft improved by practice like any other.
• "Interpreters never understand variables." An interpreter executes variable assignments step by step.
• "Every language runs the same way under the hood." Low-level and high-level languages map differently to machine code.

Teacher activities

1. Starter: run a PRINT statement and show the result without revealing the code.
2. Define programming language and name the three programming concepts.
3. Explain why high-level languages are easier than assembly on syntax and readability.
4. Describe the interpreter role and contrast it with a compiler.
5. Trace a simple interpreter program line by line and predict the output.
6. Close with the tracing task and exit question about language level.

Student activities

1. Guess the PRINT command from the starter RUN.
2. Define a programming language in their own words and name the three concepts.
3. Compare high-level and assembly languages on ease and readability.
4. Describe the interpreter role and contrast it with a compiler briefly.
5. Hand-trace one simple interpreter program and write the predicted output.
6. Answer the exit question in one sentence about high-level versus assembly.

Practical / learning evidence

A recorded interpreter program plus the documented expected output and a traced prediction. Hand in both the program and the predicted output for marking.

Resources and preparation

A computer with a BASIC interpreter installed, blank interpreter windows and a sample tracing task card. Keep the interpreter in a read-only folder for learners without install capability. Disable Caps Lock before typing.

Assessment for learning

Inspect the typed program for correct PRINT syntax. Compare the traced output with the actual interpreter output and flag any mismatch. Ask a learner to explain why LET appears before an assignment.

Inclusion and homework

Prebuild the interpreter folder with Welcome and sample programs for learners lacking install capability. Provide a tracing template with output lines preprinted. Extend confident learners with two tracing tasks and a high-level versus assembly contrast. Homework: write a one-line interpreter statement that prints HELLO.