Introduction to

Introduction To Computer Science
26
Software engineering:
It is concerned about the development of a better quality software 
by applying scientific and basic engineering principles.
Computer Networks: 
It is concerned with connecting computers for the purpose of sharing 
resources.
Database Systems: 
involves the study and design of efficient methods for information 
storage, process & retrieval.
Artificial Intelligence:
It Iis concerned with the means by which Computers can perform 
tasks that would be characterized as intelligent if performed by human beings.
Activity Conclusion
In this activity you have been introduced to basic notions such as what is computer? 
Characteristics and types of computers. Computers have undergone significant changes over 
the years since their advent, and their use spans to almost all sectors and activities. 
Assessment: Reflective Activities
• Define the term computer in your own terms?
• What are the characteristics of computers?
• How are computers classified?
Answers
• A computer is an electronic device that accepts inputs, processes the input based 
on an algorithm and finally produces an output.
• Diligent, multitasking, highly accurate, store their own instruction, etc
• Computers can be classified based on size, electronic components used for 
their development, method of operations, their purpose of use and computing 
capacity. 

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Unit 1: Introduction to Computer Systems
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Learning Activity: History of Early Days Computers 
History and Evolution of Computer Systems
History of Computer Systems
The History of computer systems is about the developments from early simple devices to aid 
calculation to modern day computers. The following are some of the calculating devices that 
precede modern day computers[3].
Abacus
: It is one of the earliest mechanical computational devices. The abacus was early used 
for arithmetic tasks. It was in use in the Middle East as early as 2500 BC The familiar Chinese 
abacus ( dating approximately 1200 AD ) is composed of a frame and a number of wires..