Institute of Commercial Management | Qualification Subject

Information Processing

Main Topics of Study

Introduction

  • Definitions of hardware, software, package, program, data, parameter.
  • Overview of the range of computers currently used from lap-top to supercomputer.
  • Configuration diagram showing how the components of a computer system are related. Difference between control signal and data flow.

Input

  • Review of methods of data capture to include OCR, OMR, MICR, barcodes, text/image scanners, magnetic stripe, voice, touch screen, keyboard, and concept keyboard.
  • Advantages and disadvantages of these methods of data capture when compared with others. In particular, a comparison of speeds, costs, user involvement, accuracy of the data received by the computer.
  • Choose the best data capture method for a given application.
  • Conditions required for each of these data capture devices to be used. A detailed explanation of the internal operation is not required.

Data Checking

  • Difference between validation and verification.
  • Validation checks – range, data type, presence, sequence.
  • Specifying the validation possible for a given set of data.

Check digit systems – normally using modulo-11 and weights 6,5,4,3,2,1 etc.

  • Specify which data can/should contain check digits.
  • State the guarantees that check digit numbers provide.
  • Calculate the check digit for a given number.
  • Validate a number which contains a check digit.
  • The use of “X” as a check digit.

Output

  • Ways in which data can be represented – tables, lists, summary statistics, charts, textual reports.
  • Name the range of printers currently available – laser, ink jet.
  • Advantages and disadvantages of different types of printers.
  • Screen output. Its limitations.
  • Identifying whether screen or printer would be more suitable for a given application.
  • Types of plotters currently available. Comparison with printers.
  • Identifying whether a printer or plotter would be more suitable for a given application.
  • Other forms of output. COM. Microfiche. Applications where these might be used.

Processor

  • Component parts of the CPU and their functions – ALU, control unit.
  • Main memory and its various forms – RAM, ROM, cache, special purpose RAM e.g. for VDU.
  • Name registers in general use – accumulator(s), program counter (PC), memory address (MAR), memory data/buffer (MDR/MBR), current instruction (CIR).
  • Bus structures.

Fetch-execute cycle.

  • Name the steps an instruction passes through in the cycle.
  • Identify how the registers are used for basic instructions.
  • e.g. LDA Price, SUB Tax. This topic must be covered in detail.

Software

  • Distinction between system software and application software.
  • Distinction between general purpose and special purpose software. Understand that the USER dictates how general purpose software is used.
  • Outline of features of operating systems including systems with multiprogramming facilities. Name different operating systems currently in use and compare in outline.

 System software

  • File management software.
  • Utility software. Sort file. Merge files.
  • Language translators. Assembler, compiler, interpreter – basic differences.

Filing Systems

  • Review of current storage devices – diskette, hard disc, Winchester, flash drive/pen stick, optical devices, digital versatile disk, tape and cassette.
  • The need for buffers and their role in data transfer.
  • Definitions of storage terms – file, record, field, cylinder, track, sector, header label, inter-block gap. Distinction between storage device and storage medium.
  • The structure of data stored on a storage medium.
  • Data transfer checks. Parity and its purpose. Describe odd/even parity with specific numeric examples illustrating acceptance/failure. Cyclic redundancy check.
  • Sequential master file update using an unsorted transaction file. Labelled system flow chart for this process.
  • Selecting the most appropriate file organisation for a given application.

File Organisation and file access

  • Define organisation types – serial, sequential, indexed sequential, random.
  • Distinction between organisation and access. Examples of a file being accessed in more than oneway.
  • For indexed sequential organisations – an understanding of up to 2-levels of indexing.
  • Appreciation that not all record keys appear in the index. How any record can be accessed.
  • Overflow areas.
  • For random access – hashing algorithms. Develop a simple algorithm for a given situation.
  • For each of the four organisation methods, describe the program sequence of steps to: (a.) access a single record from the file. (b.) add a new record to the file. (c.) delete a record from the file.

Processing

  • Different types of processing – batch and real-time.
  • The role of batch processing with today’s sophisticated systems. Examples of batch processing currently in use.
  • Real-time systems – examples of current use.

Security and Privacy

  • Security defined as the safeguard of hardware, software and data.
  • Distinction between security and privacy.
  • Realistic methods of data security – securing against: (a.) accidental damage or loss of data. (b) deliberate sabotage.
  • Methods of achieving good privacy of data.
  • Determining the security/privacy required for a given situation.

Recommended Reading

Main Text:

Refer to the ICM website for learning material.

Indicative Text:

Alternative Text and Further Reading:

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Computer Science for Advanced Level by R Bradley – (Stanley Thornes) - (Fourth edition).

A Level Computing by PM Heathcote & S Langfield – (Payne Galloway) - (Fifth edition)