Explain three functions of an information system in an organisation.
(b) Explain two benefits that a company would gain from using batch processing method for data processing
(c) (i) Convert the number 11101.1 12 to its decimal equivalent.
(ii) Perform the following binary operation 110112 + 1012
RESPONSES
a) Functions of information system in an organization.
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A school has been advised to employ a database administrator. State three responsibilities of this personnel in the school.
(b) Explain two ways in which computers can be used in the transport industry.
(c) Mary was advised to partition a hard disk for her computer. Explain two reasons that may have necessitated this. (d) Explain a reason for conducting each of the following studies in systems development: (i) Schedule feasibility; (ii) Technical feasibility.
RESPONSES
a) Possible responsibilities of a database admin in a school
Describe three arithmetic errors that may occur during computerised data processing.
(b) Arnold a programmer intends to create a user input interface screen for a system. State three factors that he should consider.
(c)With the aid of an example in each case describe the following types of maintenance. (i) adaptive; (ii) perfective; (iii) corrective.
RESPONSES
a) Arithmetic errors
Truncation error
(i) Adaptive
An organisation intends to replace an existing system by carrying out the process in stages.12/1/2021 An organisation intends to replace an existing system by carrying out the process in stages.
(a) Name this implementation strategy;
Technical feasibility:
Explain two uses of a system documentation in system development.
Uses of system documentation
With the aid of a diagram. describe time sharing mode as used in computer data processing.
(b) A company’s management has opted to use computers to process data. State four factors that the management needs to consider when selecting the company data processing mode.
(c) Explain the purpose of each of the following in system documentation: (î) user manual; (ii) sample data: (iii) table descriptions.
RESPONSES
(a) Time-sharing mode
This is a processing mode in which a central processor serves two or more users with different requirements. The processor time is divided equally among the tasks in the queue. A user whose task requirements are more than is apportioned is send back to the queue. For example, four jobs requiring times t1, t2, t3 and t4 to complete is apportioned equal time in each round until when they are done.
(b) Factors to consider when selecting data processing mode
Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.
(a) Report or documentation
(b )Disk/master file/database An organisation intends to replace an existing system by carrying out the process in stages.6/1/2021 An organisation intends to replace an existing system by carrying out the process in stages.(a) Name this implementation strategy.
The implementation strategy is:
(b) Give two reasons why the organisation is opting to use the implementation strategy in (a) above.
Reasons for partial approach.
What is an information system?
(a) (i) What is an information system?
(ii) State two roles of an information system. (b) Describe the following file organisation methods: (i) random file organisation; (ii) sequential file organisation. (c)The following records were extracted from two files that contained student data.
(i) Which of the two files above represents a Transaction file?
(ii) Give a reason for your answer in c(i) above. (iii) Name the other type of file represented above. (d)An airline uses an information system whereby if a passenger at station A books a plane seat,this transaction is immediately shown at stations A and B such that no other passenger can book the same seat. (i) Identify this data processing mode. (ii) State two advantages and two disadvantages of this data processing mode. RESPONSES
(a)(i) Information system is an arrangement of people, data, processes, communication and IT that interact to support problem solving.
(ii) Improve day-to-day operation
(ii) Method of storing or retrieving information that requires the program to start reading at the beginning and continue until it finds the desired data. (c) (i) File B. (ii) Transaction file: It contains data which is regularly added. Has data/fee payment . (iii) Master File: It contains records that do not change regularly like in file A.
(d) (i) Real time processing.
(ii) Advantages
State two roles of a programmer in system development life cycle.
State the stage of system development life cycle in which each of the following activities take place:(a) determination of the cost-effectiveness of a system;
(b) interviews;
(c) replacement of an old system with a new one.
(a) State four activities of the planning stage of systems development. (4 marks)
Activities at the planning stages
State a stage in systems development life cycle where each of the following activities are carried out:
(a) indenting the technologies that may be used in a proposed system; (1 mark)
System analysis/information gathering/problem recognition (b) indenting shortcomings of a system; (1 mark) Problem definition (c) preparing the system migration plan. (I mark) Implementation stage Explain three reasons why an organization may need to change to a new computerised system.
(b) State why each of the following is important in system documentation.
(i) Identify the types of computer files named above. (ii) Give a characteristic of data held in each file. (iii) Name the field that should be used to link the two files.
(a) Current system may be experiencing problems thereby being unable to meet organisation requirements.
New directives may be received from authorities and the organisation must comply. Changes in the operating environment forces the organisation to change in order to fit and continue in business. e.g. competition. Changes in technology requiring the upgrading or total change in the existing system. Peer pressure need to remain fashion (b) (i) Sample data should be provided so that all modules can be tested. (ii) Output reports show that the system actually works/testing process/expected output.. (c) (i) Manual: Manual files stored in cabinets/books/paper/in-tray/out-tray. (ii) Electronic: Secondary storage devices/individual storage devices e.g. Flash. (d) (i) Student: Master file/Parent/Reference File/Primary. Register: Transaction file/Child table/Secondary. (ii) Master file: Data is static/Permanent/Semi-permanent. Transaction file: Data is dynamic/Temporary/Changes frequently (iii) Key field: Student number/Admission No/Reg. No/File No. The following are some of the phases in the systems development life cycle (SDLC): system analysis, system design, system implementation, system review and maintenance. State four activities that are carried out during the system implementation phase.
(b) Give three reasons why system maintenance phase is necessary in SDLC.
(c) State two instances where observation is not a viable method of gathering information during system analysis stage. (d) Various considerations should be made during input design and output design.
State two considerations for each case.
RESPONSES
(a)(i) Activities (system implementation)
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