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  Types of Requirement

Types of Requirement

The requirement s definition and specification documents describe everything about how the system is to interact with its environment. These are various types of requirements, described below:

1. Physical Environment

* Where is the equipment or device to function?

* is there on location or several?

Are there any environmental restrictions such as temperature, humidity or magnetic interference?

1. Interface

  • Is the input coming from one more other system?
  • Is the output going to one or more other systems?
  • Is there a prescribed way in which the data must be formatted?
  • Is there a prescribed medium that the data must use?

2. Users and human Factors?

  • Who will use the system?
  • Will there be several types of users?
  • What is the skill level of each type of use?
  • What kind of training will be required for each type of user?
  • How easy will it be for a user to understand and use the system?
  • How difficult will it be for a user to misuse the system?

3.  Functionality

  • What will the system do?
  • When will the system do it?
  • Are there several modes of operation?
  • How and when can the system be changed or engaged?
  • Are these constraints on execution speed, response time memory, performance of throughput?

4. Documentation

  • How much documentation is required?
  • Should it be online, in report format or both?
  • To what audience is each type of documentation addressed?

5. Data

  • For both input and output what should be format and layout of the data be?
  • How often will they be received or sent?
  • How accurate must they be?
  • To what degree of precision must the calculations be made?
  • How much data flow through the system?

6. Resources

  • What materials, personnel or other resources are required to build use and maintain the system?
  • What skills must the developers have?
  • How much physical space will be taken up by the system?
  • What are the requirements for power, heating or air conditioning?
  • Is there a prescribed time table for development?
  • Is there a limit on the amount of money to be spent on development or on hardware and software?

7. Security

  • Must access to the system or to information be controlled?
  • How will one user data be isolated from others?
  • How will user programs be isolated from other programs and from the operating system?
  • How often will the system be backed up?
  • Must the backup copies be stored at the different locations?
  • Should precaution be taken against fire water damage or theft?

8. Quality  assurance

  • What are the requirements for reliability, availability, maintainability, security and the other quality attributes?
  • How must the characteristics of the system be demonstrated to others?
  • Must the system detect and isolate faults?
  • What is the prescribed mean time between failures?
  • Is there a maximum time allowed for restarting the system after a failure?
  • How can the system incorporate changes to the design?
  • Will maintenance merely correct errors or will it also include improving the system?
  • What efficiency measures will apply to resource usage and response time?
  • How easy should it be to move the system from one location to another or from one type of computer to another?

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