• Two Advantages Of General Purpose Software
• Advantages Of General Purpose Software Examples
• Purpose Of Application Software
• Advantages Of General Purpose Software Packages

SOFTWARE

Term software is used to refer tothe computer programs used in a computer system. Software can be broadlydivided into two categories:

General Purpose Applications Software. It provides many features that the majority of users will want e.g. Formatting text, creating charts, organising tables. But it does try to be’ all things to all people’ and so there will be a vast number of features that you may never use e.g. Statistical functions, mail merge. This makes the storage size of these applications fairly large. The two advantages of general purpose software is that it is easy to use and it is compatible with most systems. General purpose software is not limited to specific requirements. The key advantage of customized software is that it’s custom built, which means it’s specifically built according to the individual requirements. Using customized software you can achieve your tasks easily which your competitor cannot. Custom software is dear and considered as a huge investment to begin with.

The advantage is that every team member can be stayed up with up to date, rapidly managing issues as they emerge. I found many project management software at SoftwareSuggest.

1. Applications Programs;
2. Systems Programs.

APPLICATIONSOFTWARE

Application programs are written to solveend-user problems. These include:

1. payroll programs – used to generate the payroll of many businesses.
2. stock control programs – used by businesses to manage their stock efficiency
3. accounting programs – used by businesses to help manage their financial affairs. A spreadsheet program is useful for this. It allows the user to create a table of numbers and manipulate them.
4. educational programs – used in schools for teaching various subjects.
5. administration programs – used by many organisations for maintaining records of employees, customers, clients, students, creditors, members, etc.
6. computer-aided design programs – used by engineers, scientists, architects and others to speed up the designs of building, and an aeronautical engineer may use one to determine how a different tail design will affect the performance of an aircraft.
7. graphics programs – used, for instance, by an advertising agency for creating advertisements for television.
8. library control programs – used by libraries for maintaining records of books and borrowers, in order to provide faster, more efficient service.
9. word processing programs – used by all kinds of people for the efficient preparation of letters, documents and reports.

Application programs software falls intothe following categories:

XGeneral-Purpose

XCustom Written

XCustomisation of GeneralPurpose

XSpecialized Software Packages

General-Purpose Application Software

General-purpose application software isused by a large number of people in a variety of jobs and personal situations.The “Big Five” types of general-purpose application software are:

-Word processing

-Spreadsheet

-Database management

-Communication

-Graphics/Presentation

Advantages of using General Purpose Software

·You can install it yourself byfollowing the easy instruction in the installation

manual that comes with the software.

·Cheaper than employing aprogrammer to write the software for you.

·Easy Updating and Revising,each new version can be had at a reduced price if

the owner can show proof of purchase of aprevious version.

·Most users may already befamiliar with previous versions of the software, so no

intensive training programme is required.

·Several persons use thesoftware, therefore help is easy to find.

Disadvantages of General Purpose Software

·The package may be poorlydocumented

·The package may have hiddenproblems

·The package may not fit theuser’s need exactly

·The package may not be userfriendly

Custom Written Software

If you need a new outfit, you can buy thefabric and take it to a tailor, allow the tailor to take your measurement andthen make an outfit that fits you. A custom written software is a software thathas been designed or created by a programmer to meet the unique need of a useror organization. For example, you could hire a system analyst to look at theaccounting principles employed by your company and then set a team ofprogrammers to write a program to meet the requirements. This program would bea custom written software.

Advantages of Custom Written Software

·The software meets the need ofthe user specifically

·The software can grow with thecompany

·Business owners can relieve thestress placed on over burdened employees and save money from hiring additionalstaff.

Disadvantages of Custom Written Software

·Expectations can changemidstream when developing custom written software, making a realistic budgetdifficult to project. As a result, businesses often run out of money before theproject is completed.

·An experienced software team isneeded. Acquiring the right team can be costly.

·If the people who are trainedto use the program resign then it will be some time before new persons aretrained, slowing down the business functions.

Customisation of General-Purpose Software Packages

Imagine buying an outfit in a departmentstore that you like but not exactly your fit. What do you do? Find a tailor orfashion designer who can adjust it to your size. Similarly, if you find ageneral-purpose software in a software house that you like, but it needs someadjustment to meet your specific need, you can get a programmer to modify theprogram to meet your specific need. A customised general-purpose softwarepackage is a generalised software package that has been tailored to meet a useror firms specific need. Areas of the software that can be customized include:

üScreen colour

üPage size and arrangement on the desktop

üNavigation to available menus

Specialised Software Packages

Specialised software packages are writtenfor a specific discipline. An example of such packages is expert systems. Anexpert system is a type of computer application program that makes decisions orsolves problems in particular fields, such as banking or architecture, by usingknowledge and analytical rules defined by experts in the field. For example, adoctor could employ an expert system that asks a patient a series of questionsand then make a diagnosis. The software fall into two main categories:

·Business Application Programs –programs that perform the information processing tasks of important businessfunctions or industry requirements.

·Scientific Application Programs– programs that perform information processing tasks for the natural, physical,social and behavioural sciences.

SYSTEM SOFTWARE

Systems programs do not solve end-userproblems. Rather, they enable users to make efficient use of the computingfacilities for solving their problems. These programs manage the resources of acomputer system, automate its operation, and make easier the writing, testingand debugging of users’ programs. Many systems programs are supplied by thecomputer manufacturer, since to write them a programmer needs in-depthknowledge of the hardware details of the specific computer. (In contrast manyapplication programs can be written with very little knowledge of the hardwaredetails of a specific computer, and can run on several different computers withlittle or no modifications.)

The most important systems program is the‘operating system’; this actually consists of a number of programs designed toensure the smooth running of the computer system. Other common systems programs(from the user’s viewpoint) are:

1. the editor – this program enables users to create files for storing their programs and data. It also provides facilities for making changes (such as adding or deleting lines) to files.
2. language translators – people normally write programs in what are called high-level languages (such as Basic, Pascal, Fortran, or Cobol). Before the computer can run these programs, they have to be translated into the binary code known as machine language. Each language needs its own translator. Language translators can be divided into three broad classes – compilers, interpreters and assemblers.
3. diagnostic programs – these provide facilities which help users to debug (remove errors from) their programs more easily.
4. utility programs – on a typical computer system, there are many routine functions and operations which users may wish to perform. Utility programs are usually provided to perform these functions and operations. One of the most common of these is the sorting of data into desired sequence.

Operating System

An operating system may be seen as a suiteof programs that has taken many functions once performed by human operators.The sophistication and speeds of modern computers is beyond the capability ofhuman operators to control without the aid of an operating system. The role ofthe operating system is therefore one of resource management. The primaryresources it manages are:

1. processors
2. storage
3. I/O devices
4. Data
5. Programs.

It can be seen from what is said that theoperating system controls the way software uses hardware. This control ensuresthat the computer not only operates in the way intended by the user but does soin a systematic , reliable and efficient manner. This “view” of the operating systemis shown below

Part of the operating system remains inmain storage permanently during the running of the computer. This part iscalled the Kernel (or Supervisor or Executive) and as the name suggestsis the “controlling” part of the operating system. It controls the running ofall other programs. The remainder of the operating-system programs are storedon a direct-access storage device (preferably) from which any particular onewill be “called” into main storage by the kernel when required.

On many very small microcomputers thekernel is stored permanently in ROM and starts execution the moment thecomputer is switched on. A message is usually displayed by the kernel tosignify it is ready to accept commands from the user.

On most modern computers the kernel is notin main storage when the machine is switched on. The system must be “bootedup”. This sometimes involves pressing special “boot buttons”, keys or switches,which cause the hardware to load the kernel into main storage from apredetermined position on a disk.

Functions of the Operating System

ØIn multitasking where multiple programs can be running at the sametime, the operating system determines which application should run, in whatorder and how much time should be allocated for each application before givinganother application a turn.

ØIt manages the sharing of internal memory among multipleapplications.

ØIt handles input and output to and from attached hardware devices,such as hard disks, printers and dial-up ports.

ØIt sends messages to the applications or interactive users ( or to asystem operator) about the status of operations and any errors that may haveoccurred.

ØIt can offload the management of what are called batch jobs (forexample, printing) so that the initiating application is freed from this work.

ØOn computers that can provide parallel processing, an operatingsystem can decide how to divide a program so that it runs on more than oneprocessor at a time.

Choice of Operating System

The applications for which a computer isneeded largely determined the choice of hardware and accompanying software. Theoperating system supplier will need to consider these factors:

1. The hardware provision and basic design of the computer.
2. The applications intended for the computer.
3. The method of communication with the computer, e.g., many or few peripherals.
4. The method of operating the computer.

The choice of O/S is also dependent on theprocessing environment required by the user. This includes:

• Batch processing
• Time sharing multi processing
• Single User processing system
• Real time processing
• Online processing
• Single user multi-tasking processing

BatchSystems – These are systems that providemultiprogramming of batch programs but have few facilities for interaction ormulti-access. Commands or jobs are collected in groups and processed in theorder in which they are placed in the group, i.e. in a “first in first out”sequence. Each group of commands or jobs is called a batch. The jobs areentered in a batch queue and then run one or more at a time under the controlof the operating system. A job may wait in a batch queue for minutes or hoursdepending on the workload. No amendments are possible during processing.

Time-sharingmulti processing – Processor time is dividedinto small units called time slices and shared in turn between users to providemulti-access. These systems allow the CPU to switch between different programsrapidly so that users are unaware that they were ‘time-sharing’ the CPU withothers. Several persons can connect to the main computer via dumb terminals andaccess different application programs.

SingleUser Processing – These systems came on thescene with the advent of personal computers. The majority of smallmicrocomputer-based systems have operating systems, which allow a user tooperate the machine in an interactive conversational mode (response to theuser’s message is immediate) but normally only one user program to be in mainstorage and processed at a time, there is no multiprogramming of user programs.Multiprogramming occurs when more than one program in main storage is beingprocessed apparently at the same time. This is accomplished by the programstaking turns at short burst of processing time.

Single-UserMultitasking – This system only allows oneperson to use the computer at a time to do multiple tasks.

Real-TimeProcessing – is a system that is able toprocess data so quickly that the results are available to influence theactivity currently taking place. There is often a need for multiprocessing.Multiprocessing is the name for the situation that occurs if two or moreprocessors are present in a computer system and are sharing some or all of thesame memory. In such cases two programs may be processed at the same instant.These systems are used mainly in critical systems. Critical systems are systemswhere delay in the processing of data after its input can lead to thedestruction of life and property. Examples of critical systems are systems thatmonitor critically ill patients, nuclear plants, the engine of an aeroplane,etc.

Utility programs perform tasks related tothe maintenance of your computer’s health, hardware or data. Some are includedwith the operating system; others can be bought as a separate package. Utilityprograms perform tasks such as:

ØFile Management

ØDisk Management

ØBackup

ØData Recovery

ØData Compression

ØAntivirus Programs

The interaction between end-users and thecomputer is said to take place at the “Human Computer Interface” (HCI). Theterm “Human Computer Interface” is meant to cover all aspects of thisinteraction, not just the hardware. Of particular interest is what makes oneHCI better than another one.

One of the most important features normallyrequired in an HCI is that it be “user friendly.” As the name suggest, auser-friendly interface is one that the end-user finds helpful, easy to learnand easy to use. It is easy recognise unfriendly interfaces but not so easy todesign one that is certain to be user friendly.

What makes an HCI user friendly? There isno simple answer but the following points are important.

1. It should be relatively easy for the user to start using the system.
2. As far as possible, the system should be self-contained so that the user is not forced into accessing manuals or dealing with things that should be kept outside the system.
3. The amount of effort and information required of the user to get the system to complete required tasks should be kept to minimum.
4. The user should be insulated from unexpected or spurious system actions. This includes protection against being the cause of a system failure and implies that the system should also be robust and reliable.
5. The system should be able to adjust to different levels of expertise between users, and as users grow in competence.
6. The user should be made to feel in control of what is going on.
7. The system should behave in a logical and consistent manner, enabling the user to reason about what is going on and apply what has been learned.

Of course thesepoints are rather general in nature. We now turn to a number of specificpractical issues.

Types of interface

There are many different types of userinterfaces available. They may be broadly classified as follows:

1. Command Driven Interfaces
2. Menu Driven Interfaces
3. Direct Manipulation Interfaces
4. User Interface Management System (UIMS)
5. Special Purpose Interfaces.

Note. In somesituations two different kinds of interfaces may be combined, e.g. a menuinterface with command options.

Command driven interfaces

One of the long-established methods bywhich user can interact with the computer is by the use of commands. Commandsenable the user quickly and simply to instruct the computer what to do. Howeverthey require the user to already have a knowledge of what commands areavailable, what they do and the rules governing how they should be typed, sothey are more suited to experienced users than the end-user is a technicalperson, such as a computer operator or programmer, or where the end-user continuallyworks with the same program and therefore can gain mastery of the commands.

Advantages of command driven interface

• Faster to use once you have learnt the commands
• For computer programmer command driven interfaces are cheaper to implement.

Disadvantages of command driven interface

• It is sometimes difficult to remember all the commands, therefore users have to constantly refer to the software user manual
• Restrict the user to using only the keyboard as the interfacing devices, while with other interfaces a wide variety of input devices can be used.
• Commands must be entered at a special location on the screen and in a set format.

Two Advantages Of General Purpose Software

Menu-driven interfaces

Menus provide another popular form of userinterface. There are many different alternative forms of menu. The simplestmenus provide the user with a number of options and a simple means of selectingbetween them. The user is presented with a choice and therefore does not haveto remember any commands. The interface is therefore suitable for beginners andinfrequent users. All the user has to do is to make a choice. A special type ofmenu called a pop-up menu, an additional submenu pops up as a selectionis made.

Help isnormally made available to the user of a menu-driven system by means of screensof information that can temporarily be called up and displayed on the screenduring normal activities. It is best if the help information displayed is asspecific as possible the user’s current activity. Help screens are normallyactivated by a special key. Some keyboards even have a key labelled “HELP”.Similar facilities are often available in command-driven systems and areinvoked by typing a command such as “HELP”.

Pull-down menus are a special type of menu used in windowing and were brieflyintroduced. Some variations on the same idea are pop-upmenus andbelow an item on the screen in order to elicit a choice from the user.

Advantages of menu driven interfaces

• The user is presented with a list of option to choose from, they don’t need to remember commands
• Free from typing errors, because user does not have to type commands.
• A wide variety of input devices can be used to interface with a menu.

Disadvantages of menu driven interface

• Several steps required to issue a command.
• Once user has learned the menu system it is bothersome to have to wait on the package to present the questions before commands can be entered.

Graphical User Interface

A Graphical User Interface (GUI, commonlypronounced “guey”) is an HCI based upon a graphical display. GUIs are mostcommonly found on workstations or PCs fitted with graphics adapters able tosupport high-resolution graphics. A GUI is a variation of the menu-drivensystem of selecting commands with the use of the mouse. This system popularisedby the Apple Macintosh uses a graphical user interface. This consists of iconsand “pop-up” and “drop-down” menus. A mouse is used to click on an icon toexecute some operation or select options from a pop-up or drop-down menu.

Advantages of GUIs

• User friendliness results in less anxiety on the part of the user.
• Icons/symbols easier to recognise and provide the user with a context.
• Fewer command error.
• Reduce typing.

Disadvantages of GUIs

• May consume more screen space
• For programmers the design of Graphical User Interface is more complex
• Clicking an icon can produce unexpected results because of a lack of icon standard
• Increase use of computer memory can lead to slower processing.

State the propertechnical terms for EACH of the SIX underlined passages.

(b)State twofunctions of an operating system.

(c)What is the major interfacing device for

(i)a command language interface?

(ii)A graphical user interface

(c)Explain briefly ONE distinguishing feature of Eachinterface mentioned in part ii

2.What is the process of starting up a computer called? (1 mark)

3.What is an integrated software package? Give an example. (3 marks)

4. What is the difference between application software andsystem software? (2 marks)

5What category of software is the back-up and recovery tool? (1 mark)

Advantages Of General Purpose Software Examples

In computer software, a general-purpose programming language is a programming language designed to be used for writing software in the widest variety of application domains (a general-purpose language). A general-purpose programming language has this status because it does not include language constructs designed to be used within a specific application domain.

Conversely, a domain-specific programming language is one designed to be used within a specific application domain. Examples include page description languages and database query languages.

Purpose Of Application Software

The following are some general-purpose programming languages:

Advantages Of General Purpose Software Packages

See also[edit]