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Qualification Accredited
AS LEVEL
Clarification Guide
COMPUTER SCIENCE
H
For first teaching in 2015
Subject content
clarification
Version 1 ocr.org/computerscience
AS LEVEL
- Component COMPUTER SCIENCE
- The characteristics of contemporary processors, input, output and storage devices
- Software and software development
- Exchanging data
- Data types, data structures and algorithms
- Legal and ethical issues
- Component
- Elements of computational thinking
- Problem solving and programming
- 2 Algorithms
Components of a computer and their uses Content clarification Links to other topics
1.1 Input, output and storage
a) How different input output and storage
devices can be applied to the solution of
different problems.
b) The uses of magnetic, flash and optical
storage devices.
c) RAM and ROM.
d) Virtual storage.
Candidates need to have an understanding of a range of input, output and storage
devices. Candidates do not need to understand how the input and output devices
work, but must be able to recommend appropriate devices for specific situations and
be able to justify choices made.
Candidates need to understand that there are different types of storage device.
Candidates need to know about the characteristics of each type (magnetic, optical and
flash) and understand the benefits and drawbacks of each, and be able to recommend
an appropriate type of device for a given situation and justify the choice.
Candidates need to understand the purpose of ROM and RAM within a computer
system, their characteristics, and the role they play in the running of a range of different
computers e. mobile devices, embedded systems etc.
Candidates need to understand why there is a need for virtual storage, how virtual
storage works and the benefits and drawbacks of using virtual storage. Virtual storage
would be that which may appear to be local but is physically located elsewhere on the
network/remotely/in the cloud.
1.1 Structure and function of the
processor
1.1 Types of processor
computerhope/issues/
ch001361
youtu/vbFDsSnfLfw
youtu/WjZoIgnayU
Component 1
1. Software and software development
Types of software and the different methodologies
used to develop software
Content clarification Links to other topics
1.2 Operating Systems
a) The need for, function and purpose of
operating systems.
b) Memory Management (paging, segmentation
and virtual memory).
c) Interrupts, the role of interrupts and Interrupt
Service Routines (ISR), role within the fetch
decode execute cycle
d) Scheduling: Round Robin, First come first
served, Multi-level feedback queues, shortest
job first and shortest remaining time.
e) Distributed, Embedded, Multi-Tasking, Multi-
User and Real Time operating systems.
f ) BIOS.
g) Device drivers.
h) Virtual machines, any instance where software
is used to take on the function of a machine
including, executing intermediate code or
running an operating system within another
Candidates need to have an understanding of why an operating system is required,
along with the different tasks it performs within a computer system (e. resource
management, file management, interrupt handling, security, providing a platform for
software to run, providing a user interface and providing utilities).
Candidates need to understand how operating systems manage memory.
Candidates need to understand the need for, purpose and function of paging to
divide memory into usable fixed-size pages and how this aids in the transfer of
memory for example virtual memory. Candidates need to understand what is meant
by segmentation and how memory is divided into segments to allow access to
memory. Candidates need to understand what is meant by virtual memory and why
this is needed in a computer system. Candidates need to understand how paging is
used in virtual memory, and the benefits and drawbacks of having and using virtual
memory in a computer system.
Candidates need to understand the purpose of interrupts within a computer system.
Candidates need to understand why an interrupt might be generated, and what
happens within CPU and memory in order to call an interrupt service routine.
Candidates need to understand the need for scheduling of tasks by an operating
system and the benefits that scheduling brings. Candidates need to understand that
there are different scheduling algorithms, which each have benefits and drawbacks
for tasks with specific characteristics. Candidates need to understand how the
following scheduling algorithms work; round robin, first come first served, multi-level
feedback queue, shortest job first and shortest remaining time.
Candidates need to understand the different (and often overlapping) classifications
of operating systems (distributed, embedded, multi-tasking, multi-user and real time),
including the key features of each. Candidates should be able to recommend (and
justify) a type of operating system for a given scenario.
Candidates need to understand the role of the BIOS in a computer system, and the
steps that the BIOS goes through to start a computer.
Candidates need to understand what is meant by ‘device drivers’ and why they are
needed for communication between hardware and the operating system.
Candidates should be able to describe what is meant by a virtual machine, how they
can be used to execute intermediate code, how they can be used to run a software
driven machine inside a physical machine and the benefits and drawbacks of each
approach.
1.1 Input, output and storage
teach-ict/2016/
AS_Computing/OCR_H046/1_2_
software/121_operating_systems/
purpose_of_os/home_os_purpose.
html
youtu/e9klVeFgzMI
studytonight/
operating-system/cpu-scheduling
tutorialspoint/
operating_system/os_types
homepage.cs.uri/faculty/
wolfe/book/Readings/Reading07
Component 1
Types of software and the different methodologies
used to develop software
Content clarification Links to other topics
1.2 Introduction to programming
a) Procedural programming language
techniques:
• program flow
• variables and constants
• procedures and functions
• arithmetic, Boolean and assignment
operators
• string handling
• file handling.
b) Assembly language (including following
and writing simple programs with Little Man
Computer). See appendix 5d
Candidates need to have knowledge and experience of using a procedural
programming language for example Python, VB etc. There is no substitute for
practical experience when learning the content for this section. Candidates need to
understand how to control the flow of a program (sequence, iteration and selection).
Candidates need to understand the purpose and function of both variables and
constants, and be able to read, trace and write code that makes use of both variables
and constants. Candidates need to understand the benefits of using constants over
variables. Candidates need to understand the role of sub-programs (procedures and
functions) in a program, how these can be used to reduce the amount of code and
improved the efficiency. Candidates need to understand the differences between
procedures and functions, and be able to read, write and trace programs using both
procedures and functions.
Candidates need to have experience of using a range of arithmetic (+, -, /, *, MOD,
DIV) operators, Boolean (AND, OR, NOT, ==, >, <, =, >=, <=, !=) operators and
assignment operator (=). Candidates need to be able to read, trace and write
programs using these operators. Code in the exam will be written using the
OCR pseudocode guide, so candidates need to be able to read and interpret this
pseudocode – however, their answers can be in pseudocode, or program code.
Candidates need to have experience of using a range of string handling functions and
need to be able to read, trace and write program code using and combining string
handling techniques (selecting substrings, converting to upper/lowercase, converting
between characters and their ASCII values. Any functions presented in a question
which are not in pseudocode guide, will be specifically introduced.)
Candidates need to have experience of writing programs that write to and read from
text files.
Candidates’ understanding of procedural languages will largely be tested by asking
candidates to read/write/trace/amend simple programs.
Candidates need to have an understanding of the purpose and need for assembly
language. Candidates need to be familiar with the instructions given in Appendix 5d.
Candidates should be able to read, write, trace and amend programs written in the
Little Man Computer language.
1.1 Structure and function of the
processor
1.4 Data Structures
2.2 Programming techniques
2 Algorithms
techopedia/
definition/8982/procedural-language
youtu/oKUTv944SXc
peterhigginson.co/lmc/
yorku/sychen/research/
LMC/
Component 1
1. Exchanging data
How data is exchanged between different systems Content clarification Links to other topics
1.3 Databases
a) Relational database, flat file, primary key,
foreign key, secondary key, entity relationship
modelling See appendix 5e
b) Methods for capturing, selecting, managing
and exchanging data.
Candidates need to understand what is meant by a database. Candidates should be
familiar with basic database terminology such as fields, records and tables. Candidates
should know the difference between a flat file and a relational database, and be able
to explain the benefits and limitations of each approach. Candidates should have
experience of setting up and using both a flat file, and relational database.
Candidates should know what is meant by a primary key, foreign key and secondary
key and how each are used in a database. Candidates should be able produce and
follow Entity Relationship (ER) diagrams which include 1:1, 1:M and M:M relationships.
Candidates should be able to identify how tables should be linked.
Candidates need to have an awareness of a range of methods for capturing data
(such as forms, OCR, OMR and sensors) selecting data (such as Query By Example
and SQL), managing data (such as changing data by manipulating it – e. arithmetic
functions, adding, editing, deleting the data) and exchanging data (with common
formats such as CSV, JSON and XML). Candidates won’t be specifically asked about
any one of these methods but may be asked to discuss/justify suitable methods as
part of a more open question.
2.1 Thinking ahead
lucidchart/pages/
er-diagrams
youtu/ob7Zy8NgVK
1.3 Networks
a) Characteristics of networks and the
importance of protocols and standards
b) Internet structure:
The TCP/IP Stack.
DNS
Protocol layering.
LANs and WANs.
Packet and circuit switching.
c) Client-server and Peer to peer.
Candidates need to understand the definition and purpose of a network.
Candidates need to understand the purpose of, and importance of using, protocols.
Candidates should be able to discuss examples of protocols that may be used in a network/
the internet (but will not be asked to recall information about any specific protocol).
Candidates should understand the term standard, and the purpose and need for standards
in a network (or any situation where data is transferred).
Candidates need to understand the purpose and benefits of layering protocols, particularly
within the TCP/IP stack. Candidates need to know the different layers within the TCP/IP stack
and the purpose of each. Candidates need to understand how data is transmitted on the
Internet, the use of IP addresses and packets in the transfer of data. (NB: Candidates are not
expected to be familiar with the OSI model).
Candidates are expected to understand the terms LAN and WAN.
Candidates need to understand how the Domain Name System is used to find the IP
address of a URL.
Candidates need to understand the purpose, function, benefits and drawbacks of both
packet and circuit switching.
Candidates need to understand the difference between a client-server and peer-to-peer
network. Candidates need to know the benefits and drawbacks of each type of network
and be able to recommend one for a given scenario.
1.3 Web Technologies
1.5 Ethical Issues
youtu/1gdrZwBouOs
computerworld/
article/2593382/networking/
networking-packet-switched-vs-circuit-
switched-networks
Component 1
1. Data types, data structures and algorithms
How data is represented and stored within different
structures. Different algorithms that can be applied
to these structures
Content clarification Links to other topics
1.4 Data Types
a) Primitive data types, integer, real/floating
point, character, string and Boolean
b) Represent positive integers in binary.
c) Use of Sign and Magnitude and Two’s
Complement to represent negative numbers
in binary
d) Addition and subtraction of binary integers.
e) Represent positive integers in hexadecimal.
f ) Convert positive integers between Binary
Hexadecimal and denary
g) Positive and negative real numbers using
normalised floating point representation
h) How character sets (ASCII and UNICODE) are
used to represent text.
Candidates need to have an understanding of programming data types such as
integer, real, Boolean, character, string etc. Candidates need to be able to choose
appropriate data types for a situation or given data. Candidates should have
experience of programming solutions using these data types. Candidates should
have knowledge of how to convert from one data type to another (casting).
Candidates should understand how and why computers store data as binary, and
that a binary number can have a variety of different interpretations depending on
what is being stored (e. numeric, text, image, sound).
Candidates should be able to convert positive whole numbers to binary and from
binary to denary.
Candidates should know how to store negative numbers using Sign and Magnitude
and Two’s Complement. Candidates should be able to convert denary numbers to
sign and magnitude, and two’s complement – and vice-versa.
Candidates should be able to perform addition and subtraction on integer binary
numbers. (These numbers could be positive or negative using two’s complement
representation.)
Candidates need to have an understanding of the purpose and potential uses of
hexadecimal for example where and why they are used instead of binary and the
benefits of using hexadecimal over alternatives such as binary. Candidates should be
able to convert denary numbers to hexadecimal and vice-versa and from binary to
hexadecimal and vice-versa.
Candidates should have an understanding of how (positive and negative) real
numbers are represented in a binary floating-point representation, and should
be able to convert between a denary number and a real binary number. (NB the
representation used for the exam is the mantissa and exponent both represented
using two’s complement.)
Candidates should understand the need for normalised floating point numbers.
Candidates should be able to normalise a floating point number.
Candidates should have an understanding of how characters are represented in binary.
Candidates should understand the need for a character set and how a computer
makes use of a character set. Candidates should be aware of the ASCII and UNICODE
character sets and be able to explain the differences between these and the benefits
of each. Candidates should be able to use a character set, or part of a character set,
to translate characters into binary and vice-versa. (Candidates are not expected to
memorise any values in a character set)
1.2 Introduction to programming
bbc.co/education/guides/
zwsbwmn/revision/
thestarman.pcministry/asm/
hexawhat
bbc.co/education/guides/
zjfgjxs/revision/
youtu/715N3qyrYJk
youtu/YtMv4u-9poQ
youtu/tKZsdbn8XQs
Component 1
How data is represented and stored within different
structures. Different algorithms that can be applied
to these structures
Content clarification Links to other topics
1.4 Data Structures
a) Arrays (of up to 3 dimensions), records, lists,
tuples
b) The properties of stacks and queues.
Candidates should be able to describe what is meant by arrays (up to 3 dimensions), records,
lists and tuples. Candidates are expected to be able recognise when they can be used and
incorporate them in their programs to store data.
Candidates should have an understanding of the purpose and use of a record structure to
store data of different data types in a program. Candidates should have experience of using
records to store, search, manipulate and retrieve data.
Candidates should have an understanding of the purpose and use of a list to store data in a
program. Candidates should have experience of using lists to store, search, manipulate and
retrieve data.
Candidates should have an understanding of the purpose and use of tuples to store data in
a program. Candidates should have experience of using tuples to store, search, manipulate
and retrieve data.
Candidates need to have an understanding of the behaviour of stacks and queues (i. LIFO
and FIFO).
1.2 Introduction to programming
2.3 Algorithms
cs.
edu/~adamchik/15-121/lectures/
tutorialspoint/data_
structures_algorithms/stack_algorithm.
htm
tutorialspoint/data_
structures_algorithms/dsa_queue
cs.bu/teaching/c/stack/
array/
youtu/b8s0-VLkVA
youtu/K72XTSusEO
youtube/watch?v=okr-
XE8yTO
cs.bu/teaching/c/
queue/array/types
Component 1
1. Legal and ethical issues
The individual (moral) and social (ethical)
opportunities and risks of digital technology and the
laws surrounding the use of computers and ethical,
moral and cultural issues that can or may in the future
arise from the use of computers
Content clarification Links to other topics
1.5 Computing related laws
a) Data Protection Act 1998.
b) Computer Misuse Act 1990.
c) Copyright and Patents Act 1988.
d) Regulation of Investigatory Powers Act 2000.
Candidates need to have an understanding of the need for and purpose of laws
relating to the use of computers.
Candidates should be familiar with the purpose and role of the Data Protection
Act. Candidates will need to understand the different rules that are within the
DPA and how these impact the use of computers and the storage of data by
organisations. This should include what organisations can and cannot do.
Candidates need to understand the purpose and principles of the Computer
Misuse Act, including the actions that it prohibits.
Candidates need to understand the purpose and principles of the Copyright and
Patents Act, including the actions that it prohibits.
Candidates need to understand the purpose and principles of the Regulation of
Investigatory Powers Act, and what this allows in interception and monitoring of
electronic communication.
Candidates need to understand how the regulations impact organisations and
the use of computers and electronic communication.
We are aware the law is constantly changing and some of the mentioned
laws/acts (most notably the DPA) are likely to change over the course of the
specification. Answers will be accepted that use an interpretation of the law
based on when the specification was started or when the examination was sat.
Please note, a question that requires an extended response can be asked from
any area within the specification. These questions are assessed using a level
of response framework, where the response requires specific areas to have
been covered to allow it to reach that level. In this area of the specification,
for example, a question may be asked on the social and ethical impacts of a
specific technology in a specific scenario or context. To gain the highest level,
candidates would need to discuss whichever moral or social elements are
relevant in the question, and because there is a context, every point they make
should be in the context given, or related after to the context. If the question
requires a judgment, or conclusion, then this needs to be given and justified
against the context given.
legislation.gov/
ukpga/2000/23/contents
youtu/R1ymVnk5XZA
youtu/DdZWxllYKQk
Component 1
The individual (moral) and social (ethical)
opportunities and risks of digital technology and the
laws surrounding the use of computers and ethical,
moral and cultural issues that can or may in the future
arise from the use of computers
Content clarification Links to other topics
1.5 Ethical Issues
The individual moral, social, ethical and cultural
opportunities and risks of digital technology:
• Computers in the workforce
• Automated decision making
• Artificial intelligence
• Environmental effects
• Censorship and the Internet
• Monitor behaviour
• Analyse personal information
a) The ability to articulate cultural opportunities
and risks of digital technology
• Language and differing alphabet and
character sets
• Use of cultural colour paradigms
In order to prepare for this section we would recommend candidates regularly keep
abreast of technological developments in the news.
Candidates need to understand what is meant by moral, social, ethical and cultural
issues in relation to the use of computers.
Candidates need to understand how the use of computers, and the increasing use of
computers in the work force has moral, social, ethical and cultural implications and risks
to a variety of people such as the employees, employers, society and organisations.
Candidates need to understand how the use of computers to make decisions
automatically has moral, social, ethical and cultural implications and risks to a variety
of people such as those people who make the decisions, the people the decisions
affect, and the need for additional collection of information to ensure the decisions are
accurate and valid.
Candidates need to understand how the development of artificial intelligence has
moral, social, ethical and cultural impacts on a variety of people.
Candidates need to understand how the environmental effects of computers (such as
disposal, energy use) have moral, social, ethical and cultural implications.
Candidates need to understand how the Internet and censorship on the Internet has
moral, social, ethical and cultural implications.
Candidates need to understand the moral, social, ethical and cultural implications
of using computers to monitor behaviour (such as CCTV, tracking phone calls, GPS,
monitoring emails).
Candidates need to understand the moral, social, ethical and cultural implications of
using computers to analyse personal information (such as the gathering, storing and
analysing of medical records)
Candidates need to understand how different cultures impact on the use of and
creation of computers and programs. For example languages make use of different
characters, and how this in turn impacts the use of character sets. Some languages
read left to right, and others right to left. Candidates should understand how colours
have different meanings in different cultures for example red means danger in one
culture, and luck in another. Candidates need to consider how these will impact the
creation of computer applications.
1.3 Networks
bbc.co/ethics/introduction/
intro_1
aitopics/
search?filters=taxnodes:Technology%
CInformation%
Technology%7CArtificial%
Intelligence%7CIssues%7CSocial%
%26%20Ethical%20Issues
philosophynow/issues/110/
Surveillance_Ethics
informationisbeautiful/
visualizations/colours-in-cultures/
empower-yourself-with-color-
psychology.com/cultural-color
Component 1
Understand what is meant by computational
thinking
Content clarification Links to other topics
2.1 Thinking logically
a) Identify the points in a solution where a
decision has to be taken.
b) Determine the logical conditions that affect
the outcome of a decision.
c) Determine how decisions affect flow
through a program.
Candidates need to understand that decisions are made within programs, and they
need to be able to identify where these decisions will take place within an algorithm
or program, and be able to understand what these decisions are and the impact of
these decisions on the algorithm/program and the next (and final) outcomes from the
algorithm/program. Candidates need to understand that there can be many different
routes through a program, and understand how decisions influence these routes and
outcomes.
2.1 Thinking abstractly
2.1 Thinking ahead
2.1 Thinking procedurally
2.3 Algorithms
youtu/2ybo8KiU32k
youtu/ZrPz-ENUhbs
Component 2
2. Problem solving and programming
How computers can be used to solve problems and
programs can be written to solve them
(Learners will benefit from being able to program in a
procedural/imperative language.)
Content clarification Links to other topics
2.2 Programming techniques
a) Programming constructs: sequence,
iteration, branching.
b) Global and local variables.
c) Modularity, functions and procedures,
parameter passing by value and reference.
d) Use of an IDE to develop/debug a program.
Candidates need to be able to understand the constructs of sequence, iteration and
branching. Candidates must be able to use these constructs independently of each
other, and combine them to produce a solution. These include the selection statements
of if (include elseif and else) and select case statements. These include both condition
based iteration (e. while, repeat until) and count controlled iteration (e. for) – as well
as how condition based can be used as count controlled iteration.
Candidates need to be able to read code using these constructs, create code using
these constructs and trace code (for example using a trace table).
Candidates need to understand the use and need for variables in a program, and must
understand the difference, benefits and drawbacks of both global and local variables.
Candidates must be able to recognise where local and global variables are used, and
the impact that these have on the program, for example the amount of memory used
by the program. Candidates need to understand how a program using global variables
can be changed to use local variables – and vice-versa.
Candidates need to understand what is meant by modular code, and how this can
be produced using functions and procedures. Candidates need to understand
the differences between functions and procedures and how each is used within a
program. Candidates need to be able to read, trace and write code using functions and
procedures.
Candidates need to understand the purpose and use of parameters within a program,
and how they are used in functions and procedures. Candidates will need to be able to
read, trace and write code that makes use of parameters.
Candidates need to understand the difference between passing a parameter by
value and by reference, they need to understand the benefits and drawbacks of each,
recommending which should be used for a given situation. Candidates need to be able
to read, trace and write code that makes use of parameters passed both by value and by
reference.
Candidates should have had experience of using an IDE to produce code. Candidates
need to understand how an IDE can be used to produce code, and understand the
range of features and tools that are within an IDE that can be used to help produce and
debug a program.
2.1 Thinking abstractly
2.1 Thinking ahead
2.1 Thinking procedurally
2.1 Thinking logically
2.3 Algorithms
vle.moirahouse.co/
studentwebsites/ict/theteacherict/
newalevel/cp1_2_1
users.csc.calpoly/~jdalbey/
SWE/pdl_std
youtu/xBAMBDyDu0s
youtu/tfIZNOyF8yA
youtu/1vcCx1ndV2Q
Component 2
2 Algorithms
The use of algorithms to describe problems and
standard algorithms
Content clarification Links to other topics
a) Analysis and design of algorithms for a given
situation.
b) Standard algorithms (Bubble sort, insertion sort,
binary search and linear search).
c) Implement bubble sort, insertion sort.
d) Implement binary and linear search.
e) Representing, adding data to and removing data
from queues and stacks.
f ) Compare the suitability of different algorithms for a
given task and data set.
g) Analysis and design of algorithms for a given
situation.
h) Standard algorithms (Bubble sort, insertion sort,
binary search and linear search).
i) Implement bubble sort, insertion sort.
j) Implement binary and linear search.
k) Representing, adding data to and removing data
from queues and stacks.
l) Compare the suitability of different algorithms for a
given task and data set.
Candidates need to be able to write algorithms using flow charts, pseudocode and
program code. Candidates need to be able to follow the code as shown in the OCR
pseudocode guide, but are not expected to write code in this syntax. Candidate’s code
is not expected to be syntactically correct, but must use appropriate code structures.
Candidates need to understand the need for standard sorting algorithms. Candidates
need to understand how the sorting algorithms bubble and insertion work and the
situations when each can, and cannot be used. Candidates need to be able to use the
algorithms to sort data, and complete, write and correct algorithms to perform each
sorting algorithm.
Candidates need to understand the need for standard searching algorithms.
Candidates need to understand how the searching algorithms binary and linear work
and the situations when each can, and cannot be used. Candidates need to be able to
use the algorithms to search data sets for specific values that may, or may not exist in
the data set. Candidates need to understand when each searching algorithm can, and
cannot be used. Candidates need to be able to complete, write and correct algorithms
to perform each searching algorithm.
Candidates should have experience of using the data structures stacks and queues.
Candidates need to understand the differences and similarities between stacks and
queues. Candidates need to be able to add and remove data from both stacks and
queues. Candidates need to understand how pointers are used within stacks and
queues. Candidates need to understand how stacks and queues can be implemented
in a computer system, for example through the use of an array with pointers.
Candidates need to be able to read, correct and write algorithms to add and remove
data items, and manipulate data items in a stack and queue.
Candidates need to understand how the choice of algorithm can be affected by the
data set. Candidates need to understand the impact of specific algorithms on speed
and memory use. Candidates are not expected to know about Big O notation, but
should be aware of how and when a program can use more memory, or can take
longer to run and be able to compare algorithms to determine which will use more/less
memory, and which will run faster/slower.
2.1 Thinking procedurally
2.1 Thinking logically
2.2 Programming techniques
youtu/iPGUYPQWeTI
youtu/uTfiT8Z5tMQ
youtu/NHDuXoaoqEA
cs.
edu/~adamchik/15-121/lectures/
Stacks%20and%20Queues/Stacks%
and%20Queues
tutorialspoint/data_
structures_algorithms/stack_algorithm.
htm
tutorialspoint/data_
structures_algorithms/dsa_queue
cs.bu/teaching/c/
stack/array/
Component 2
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Subject content - klj
Subject: Computer Science
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Degree • Grade:
Sixth Form (A Levels)
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Qualification
Accredited
AS LEVEL
Clarification Guide
COMPUTER SCIENCE
H046
For first teaching in 2015
Subject content
clarification
Version 1
www.ocr.org.uk/computerscience
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