NCERT Class 11 Computer Science Computer Science: Chapter 4 — Introduction to Problem Solving
This chapter, "Introduction to Problem Solving" from NCERT Class 11 Computer Science, emphasizes that problem-solving is a crucial skill for computer science students. It explains that computers automate tasks efficiently but require precise, step-by-step instructions from humans. The chapter outlines the core process: identifying a problem, designing a solution (algorithm), and implementing it (program). It details the key steps involved in problem-solving, starting with analyzing the problem to clearly understand its requirements, inputs, and desired outputs. The text introduces the concept of an algorithm as a set of exact steps, akin to a recipe, used to solve a problem or accomplish a task, and highlights the importance of GIGO (Garbage In, Garbage Out) in ensuring correct outputs. This foundational understanding is vital for developing effective computer programs.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 11 |
| Subject | Computer Science |
| Book | Computer Science |
| Chapter | Chapter 4 — Introduction to Problem Solving |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 4 minutes |
| Word count | 715 |
Learning outcomes
- Understand the importance of problem-solving in computer science.
- Identify the key steps involved in solving a problem.
- Define and understand the concept of an algorithm.
- Recognize the role of precise instructions in computer programs.
- Grasp the GIGO principle in computing.
Vocabulary
| Word | Meaning |
|---|---|
| Abstraction | Creating the right model for a problem. |
| Computerisation | Using computers to automate routine human tasks efficiently. |
| Algorithm | A set of exact steps to solve a problem or accomplish a task. |
| GIGO | Garbage In, Garbage Out; correctness of output depends on correctness of input. |
| Decomposition | Breaking down a complex problem into smaller, manageable parts. |
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Practice questions
- What is the role of a computer scientist in problem-solving? Answer: A computer scientist needs to precisely define the problem, design a solution (algorithm), and implement the solution (program).
- What is an algorithm? Answer: An algorithm is a set of exact steps which, when followed, solve the problem or accomplish the required task.
- Explain the GIGO principle. Answer: GIGO stands for Garbage In, Garbage Out. It means the correctness of the output that a computer gives depends upon the correctness of the input provided.
- Why is it important to analyze a problem before developing a solution? Answer: Analyzing the problem helps to clearly understand what needs to be solved, list principal components, decide core functionalities, and determine inputs and outputs.
Frequently asked questions
What is the main idea of 'Introduction to Problem Solving' in Computer Science?
The chapter emphasizes that computers solve problems by following precise instructions, and humans are responsible for defining the problem and designing the solution (algorithm).
What are the initial steps in solving a problem with a computer?
The initial steps involve precisely identifying and analyzing the problem to understand its requirements, inputs, and desired outputs.
What is an algorithm in the context of computer science?
An algorithm is a well-defined, step-by-step procedure or set of instructions designed to solve a specific problem or perform a computation.
What does 'computerisation' mean?
Computerisation refers to the use of computers to automate routine human tasks efficiently and accurately.
Why is understanding the problem crucial before creating a solution?
Clearly understanding the problem ensures that the developed solution (program) effectively addresses the intended purpose and requirements.
What is the significance of the GIGO principle?
GIGO (Garbage In, Garbage Out) highlights that the quality and correctness of a computer's output are entirely dependent on the quality and correctness of the input it receives.
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NCERT Class 11 Computer Science — Computer Science — Chapter 4 — Introduction to Problem Solving. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.