This document provides an overview of computer science for 9th class. It defines what a computer is and its main components: computer software and computer hardware. It also discusses problem solving, noting that it is a process that involves discovering, analyzing, and solving problems. Key steps in problem solving are defined, including defining the problem, understanding it, planning a solution, defining possible solutions, and selecting the best one.

1. COMPUTER SCIENCE
CLASS 9TH
Session 2020-21
Prepared by
IMRAN KHUSHI

2. What is COMPUTER?
A computer is an electronic device that accept
data process it and convert it into useful
information
There are two main components of computer
system.
1. Computer software
2. Computer hardware

3. COMPUTER SCIENCE
CLASS 9TH
CH NO 1
PROBLEM SOLVING

4. PROBLEM SOLVING STEPS
FLOWCHART
ALGORITHM
TEST DATA
VERIFICATION &
VALIDATION
IDENTIFICATION &
CORRECTION OF ERRORS

5. PROBLEM SOLVING
Problem solving is the process that involve
DISCOVERING
ANALYZING
SOLVING
PROBLEM

6. PROBLEM SOLVING
Problem solving is the process that involve
DISCOVERING
ANALYZING
SOLVING
PROBLEM
Problem solving is the process that involve discovering,
analyzing and solving the problems.

7. PROBLEM SOLVING STEPS
• Defining the Problem
• Understanding the Problem
• Planning a Solution
• Defining Candid solutions
• Selecting the best solution

8. 1.DEFINING THE PROBLEM
. A well-defined problem is the one that does not
contain ambiguities. All the conditions are clearly
specified and it has clear goal. It is easy to
understand and solve
1. Gain background knowledge
2. Use guesses
3. Draw a picture

9. Strategies to define the problem