comp4 unit9c lecture slides

Introduction to Information and Computer ScienceInformation Systems

Lecture cThis material (Comp4_Unit9c) was developed by OHSU, funded by the Department of Health and Human Services, Office of

the National Coordinator for Health Information Technology under Award Number IU24OC000015.

Information SystemsLearning Objectives

• Define an information system, how one is used and list examples. (Lecture a)

• Describe the components of an information system. (Lecture a)• Describe the process for developing an information. (Lecture b)• Describe the different types of testing and when testing should

occur. (Lecture c)• Describe how information systems are supported and maintained

over time. (Lecture c)• Describe specialized information systems. (Lecture d)• Explain how information systems are used in healthcare. (Lecture d)

2Health IT Workforce Curriculum Version 3.0/Spring 2012

Introduction to Information and Computer Science Information Systems

Lecture c

System Testing and Evaluation

• Occurs throughout development process• Evaluation

– Requirements– Designs– Implementation

• Includes software and system testing



Lecture c

Testing Overview

• Create the Test Plan• Determine Test Cases and Test Data• Execute Tests

– Test Environment– Automate Tests

• Fix Bugs and Retest• Repeat as Necessary



Lecture c

Test Plan

• Testing goals• Key areas of focus• Testing deliverables• How tests will run• List of items to test• Roles and

responsibilities

• Prerequisites• Environment• Assumptions• What to do when test

is successful• What to do when test

fails• Glossary of terms



Lecture c

Test Cases

• Test cases are written to:– Cover all use cases and scenarios– Validate technical requirements and specifications– Verify the application/system meets the business and

functional requirements specified– Verify the system meets performance standards

• Formal and Informal Test Cases• Scenario testing



Lecture c

Contents of Test Cases

• Test Case ID• Test Case

Description:– What to test– How to test

• Input Data• Expected Result• Actual Result• Pass? or Fail?

• Additional information may also be captured:– Test Suite Name– Test Category– Tested By– Test Date– Test Iteration



Lecture c

Testing Sequence

• Unit testing• Integration testing• System testing• System integration testing• User acceptance testing



Lecture c

Testing for Users

• Usability• Accessibility

– Americans with Disabilities– Section 508 of the Rehabilitation Act– Web Accessibility Initiative



Lecture c

Testing Types (1 of 2)

• Load• Stress • Maintenance

• Ad Hoc• Exploratory • Installation



Lecture c

Testing Types (2 of 2)

• Recovery• Reliability • Regression• Sanity

• Scalability• Security• Smoke• Volume



Lecture c

System Performance Testing

• Performance and Measurement– Response time– Bandwidth– Throughput– Turnaround

• Capacity Planning



Lecture c

Systems Support & Security

• Managing systems support and security:– User Support– Systems Maintenance– System Security– Physical Security– Backup and Recovery– System Obsolescence



Lecture c

User Support

• User training• Minimize productivity losses• Help users do their jobs faster/ better

• Help desk• Show how to use system resources• Answer questions• Teach• Contact point



Lecture c

Systems Maintenance

• Updates to a current system• Includes

– Hardware updates– Software updates– Security updates– System repairs

• Responds to users' needs



Lecture c

Maintenance Tasks

• Corrective• Adaptive• Perfective• Preventive



Lecture c

System Security

• CIA model– Confidentiality– Integrity– Availability



Lecture c

System Security• Physical security

• Operations center security• Servers, desktop computers, notebook, laptop

and tablet computers• Network security• Application security• File security• User security• Procedural security



Lecture c

Backup and Recovery

• Backup Policies– Types of backups – Backup media– Retention periods

• Recovery issues– Disaster recovery plan – Business Continuity Plan (BCP)



Lecture c

System Obsolescence

• No longer supports users needs• Becomes out-dated• Economically no longer useful



Lecture c

Information SystemsSummary – Lecture c

• Systems testing occurs during each phase of systems development

• Testing occurs at the unit level and at the system level

• Systems support and security ensures that the system performs as it should once its been implemented



Lecture c

Information SystemsReferences – Lecture c

References • Evans, A., Martin, K., & Poatsey, M. (2010). Technology in Action: Complete (7th ed.). New York: Prentice Hall.• ISO/AWI TR 9241. (1997). Retrieved Nov 26, 2011, from International Organization for Standardization:

http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=55486• Kay, R. (2002, May 14). Quick Study: System Development Life Cycle. Retrieved 11 23, 2011, from

Computerworld: http://www.computerworld.com/s/article/71151/System_Development_Life_Cycle• Parsons, J., & Oja, D. (2010). New Perspectives on Computer Concepts 2011: Comprehensive (13th ed.).

Boston: Course Technology.• Perrin, C. (2008, June 30). HIT Security - The CIA Triad. Retrieved December 22, 2011, from TechRepublic

website: http://www.techrepublic.com/blog/security/the-cia-triad/488• Shelley, G., & Rosenblatt, H. (2010). Systems Analysis and Design (8th ed.). Boston: Course Technology.• Shelley, G., & Vermaat, M. (2010). Discovering Computers 2011: Introductory. (1st ed.). Boston: Course

Technology.• Software Testing. (2011, Nov 23). Retrieved Nov 26, 2011, from Wikipedia:

http://en.wikipedia.org/wiki/Software_testing• Stair, R., & Reynolds, G. (2010). Fundamentals of Information Systems (5th ed.). Boston: Course Technology.• System Testing. (2011, Jun 7). Retrieved Nov 26, 2011, from Wikipedia:

http://en.wikipedia.org/wiki/System_testing• Systems Development Life Cycle. (2011, Nov 22). Retrieved Nov 23, 2011, from Wikipedia:

http://en.wikipedia.org/wiki/Systems_development_life-cycle#Systems_development_phases• What is Systems Maintenance. (2011, Aug 26). Retrieved Nov 26, 2011, from WiseGeek:

http://www.wisegeek.com/what-is-system-maintenance.htm• Whitten, J., & Bentley, L. (2007). Systems Analysis and Design Methods (7th ed.). McGraw-Hill.



Lecture c

comp4 unit9c lecture slides

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