Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Computer Science
Lesson Topic: Construct a logic expression
Learning Objective/s:
  • Describe the function and symbols of basic logic gates.
  • Translate English problem statements into Boolean clauses.
  • Construct correct Boolean expressions using appropriate operators and parentheses.
  • Validate expressions by creating truth tables or testing input combinations.
Materials Needed:
  • Projector or interactive whiteboard
  • Slides/handout on logic gates and symbols
  • Worksheet with practice problems
  • Computers with a logic‑circuit simulator (e.g., Logisim)
  • Whiteboard markers
  • Printed truth‑table templates
 Introduction:
Begin with a quick demonstration of a real‑world alarm system, asking students what conditions would trigger it. Review the symbols and truth tables of basic gates from the previous lesson. Explain that today they will learn to convert such descriptions into precise Boolean expressions, and that success will be measured by correctly building and testing an expression.
Lesson Structure:
  1. Do‑now (5') – Short quiz on gate symbols and truth tables displayed on the board.
  2. Mini‑lecture (10') – Review Boolean operators, precedence, and the role of parentheses.
  3. Guided practice (15') – Teacher models translating the alarm example step‑by‑step, constructing the expression and drawing the circuit.
  4. Collaborative activity (20') – Pairs identify variables, write the Boolean expression, and draft a truth table for a new problem.
  5. Whole‑class check (10') – Pairs share their expressions; teacher confirms correctness and addresses common pitfalls.
  6. Exit ticket (5') – Students write one key rule they will remember when constructing expressions.
Conclusion:
Summarise the five‑step process for building a logic expression and remind students to always verify with a truth table. Collect the exit tickets to check understanding of the personal rule each student noted. Assign homework: complete the three practice questions in the worksheet and bring any questions to the next lesson.