Usability Engineering Process flow Model<br />Presented by: Sivaprasath Selvaraj<br />
Agenda<br />What is Usability Engineering?<br />What is Usability?<br />What makes Usability into Design?<br />Flow Diagra...
Business case for Usability
Lack of Usability
ROI Measures
Approach to Design
Interface Design Occurs Late in Engineering
Less User-Centered Design – More Hidden Costs
More User-Centered Design – Less Hidden Costs</li></li></ul><li>Agenda<br />Step 2 – Planning<br />Step 3 – Execution<br /...
Real Example: Design Strategy
Basic Parameters of User Profiles
User Profile Example
Task Profile Example
Task Prioritization
Environmental Profile
Task Analysis – Before & After
The Purpose of Task Analysis
Navigation Structure
Information Architecture
Wireframes
Prototypes
Peer Review
Expert Review
Heuristic Evaluation</li></li></ul><li>What is Usability Engineering?<br />Usability engineering is a field that is concer...
What is Usability?<br />Several formal and informal definitions of usability exist. The most widely recognized is probably...
Benefits of Usability<br />User Effectiveness<br />Development Costs<br />Revenue<br /><ul><li>Increase success rate and r...
Improve ease of use and ease of learning
Increase user productivity and user satisfaction
Increase user trust in the system
Reduce support costs and training costs
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Usability Engineering Process Flow Model - Sivaprasath Selvaraj

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  • QUAVAC Vacuflow Central Vacuum Station (a concrete cellar underground) has vacuum tank with specific size with vacuum pumps to create vacuum in the tank and also in the complete pipe network. Also, the central vacuum station will have a set of discharge pumps.
    For More…….http://www.quavac.con

    Vacuum station are studied separately. As Vacuum Sewer is operating with vacuum, the lift in every separate pipe line must be calculated. Also the pipe length must be considered. As mentioned earlier, the Vacuum Sewer method utilizes the atmospheric pressure for the sewage disposal. The vacuum station is normally operating at a vacuum level of 60-65 kPa. The vacuum level in the interface unit at the discharge valve shall never be less than 25 kPa and the lift in the interface unit shall normally not be higher than 1.5 m. As a general rule the loss of vacuum between the station and to any interface unit shall not be higher than 3.5 m. for more……http://www.quavac.com
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Usability Engineering Process Flow Model - Sivaprasath Selvaraj

  1. 1. Usability Engineering Process flow Model<br />Presented by: Sivaprasath Selvaraj<br />
  2. 2. Agenda<br />What is Usability Engineering?<br />What is Usability?<br />What makes Usability into Design?<br />Flow Diagram of Usability Engineering in SDLC<br />How to fit Usability Engineering in SDLC? Step 1 – Pursuit<br /><ul><li>Benefits of Usability
  3. 3. Business case for Usability
  4. 4. Lack of Usability
  5. 5. ROI Measures
  6. 6. Approach to Design
  7. 7. Interface Design Occurs Late in Engineering
  8. 8. Less User-Centered Design – More Hidden Costs
  9. 9. More User-Centered Design – Less Hidden Costs</li></li></ul><li>Agenda<br />Step 2 – Planning<br />Step 3 – Execution<br />Step 4 – Monitoring & Control<br /><ul><li>Value of a Design Strategy
  10. 10. Real Example: Design Strategy
  11. 11. Basic Parameters of User Profiles
  12. 12. User Profile Example
  13. 13. Task Profile Example
  14. 14. Task Prioritization
  15. 15. Environmental Profile
  16. 16. Task Analysis – Before & After
  17. 17. The Purpose of Task Analysis
  18. 18. Navigation Structure
  19. 19. Information Architecture
  20. 20. Wireframes
  21. 21. Prototypes
  22. 22. Peer Review
  23. 23. Expert Review
  24. 24. Heuristic Evaluation</li></li></ul><li>What is Usability Engineering?<br />Usability engineering is a field that is concerned generally with human-computer interaction and specifically with making human-computer interfaces that have high usability or user friendly. In effect, a user-friendly interface is one that allows users to effectively and efficiently accomplish the tasks for which it was designed.<br />The term usability engineering (in contrast to interaction design and user experience design) implies more of a focus on assessing and making recommendations to improve usability than it does on design, though Usability Engineers may still engage in design to some extent, particularly design of wire-frames or other prototypes.<br />
  25. 25. What is Usability?<br />Several formal and informal definitions of usability exist. The most widely recognized is probably the ISO definition:<br />The usability of an interface is a measure of the effectiveness, efficiency and satisfaction with which specified users can achieve specified goals in a particular environment with that interface.<br />Usability is the ease of use and learnability of a human-made object.<br />
  26. 26. Benefits of Usability<br />User Effectiveness<br />Development Costs<br />Revenue<br /><ul><li>Increase success rate and reduce users errors
  27. 27. Improve ease of use and ease of learning
  28. 28. Increase user productivity and user satisfaction
  29. 29. Increase user trust in the system
  30. 30. Reduce support costs and training costs
  31. 31. Reduce development costs and time
  32. 32. Reduce maintenance costs
  33. 33. Increase product sales, revenue and market share
  34. 34. Increase site traffic and transactions/purchases
  35. 35. Attract and retain more customers</li></li></ul><li>Business case for Usability<br />Increase user satisfaction <br />Increase user loyalty <br />Increase user adoption<br />Reduce development costs<br />Reduce support costs<br />Reduce documentation times<br />Reduce maintenance costs<br />
  36. 36. Lack of Usability<br /> Although the definition of usability may be the subject of some discussion, lack of usability is readily recognizable. Systems that lack usability are characterized by:<br />Existence of workarounds - because the interface is difficult or does not match workflow in the real world, users develop workarounds to compensate for the inadequacies of the system <br />Low usage levels - Users use the system as little as possible. <br />Dissatisfaction - Users, and particularly novices, will find the system difficult or frustrating to use <br />Rework or double-handling - Inefficient design often means that the same data may need to be entered or read more often than is necessary. <br /> Because incorporating usability is a quality activity, it often occurs that systems with poor usability are also deficient in other areas. For example, they are likely to be crash-prone, poorly documented and difficult to maintain. <br />
  37. 37. ROI Measures<br />
  38. 38. Approach to Design<br />Technology driven<br />Component focus<br />System driven (Use Cases)<br />Product defect view of quality<br />Focus on system robustness<br />User Centered Design driven<br /><ul><li>Solutions focus
  39. 39. (Real-world) Scenario driven
  40. 40. Task success view of quality
  41. 41. Focus on User Interface robustness</li></li></ul><li>Interface Design Occurs Late in Engineering<br />
  42. 42. Less User-Centered Design – More Hidden Costs<br />
  43. 43. More User-Centered Design – Less Hidden Costs<br />
  44. 44. Flow Diagram of Usability Engineering in SDLC<br />Design Strategy<br />Personas & Profiles<br />Scenarios<br />Requirement Gathering<br />Task flow Analysis<br />NavigationStructure<br />Information Architecture<br />Wireframes<br />Final Product OrApplication<br />Prototypes(Low-Fidelity & Hi-Fidelity)<br />Usability Testing on Hi-Fidelity prototypes<br />
  45. 45. Usability Engineering in SDLC<br />Step 1 - Pursuit<br />People<br />Process<br />Technology<br />Monitoring &Control<br />Planning<br />Initiating<br />Execution<br />Closure<br />Pursuit<br /><ul><li>Design Strategy</li></ul>In Pursuit stage, POC (Proof of Concept) is created with overflow of Design Strategy.<br />
  46. 46. Usability Engineering in SDLC<br />Step 2 - Planning<br />People<br />Process<br />Technology<br />Monitoring &Control<br />Planning<br />Initiating<br />Execution<br />Closure<br />Pursuit<br /><ul><li>Refined Design Strategy</li></ul>1. Business Goals<br />2. Target Users<br />3. General Tasks<br />4. Technological Constraints<br />5. Marketing / Branding Goals<br />6. Critical Success Factors<br /><ul><li>Personas & Profiles</li></ul>1. User Groups<br />2. User Profiles<br />3. Environmental Profiles<br />4. Task Profiles<br /><ul><li>Scenarios
  47. 47. Requirement Gathering</li></ul>1. Interviews<br />2. Survey<br />3. Contextuel Observation<br />4. Focus Groups<br />5. JAD Sessions<br />In Planning stage, documents are created in detail, 1. Refined Design Strategy, 2. Personas & Profiles, 3. scenarios and 4. Requirement gathering.<br />
  48. 48. Value of a Design Strategy<br />
  49. 49. Real Example: Design Strategy<br />
  50. 50. Usability Engineering in SDLC<br />Step 3 - Execution<br />People<br />Process<br />Technology<br />Monitoring &Control<br />Initiating<br />Planning<br />Closure<br />Execution<br />Closure<br /><ul><li>Task flow Analysis
  51. 51. Navigation Structure
  52. 52. Information Architecture
  53. 53. Wireframes
  54. 54. Low Fidelity Prototypes
  55. 55. High Fidelity Prototypes</li></ul>Once Design Strategy is completed, Execution stage take place with following methods, 1. Task flow Analysis<br /> 2. Navigation Structure<br /> 3. Information Architecture<br /> 4. Wireframes and<br /> 5. Low Fidelity & High Fidelity Prototypes<br />
  56. 56. The Purpose of Task Analysis<br />
  57. 57. Task Analysis – Before & After<br />
  58. 58. Navigation Structure<br />
  59. 59. Information Architecture<br />
  60. 60. Wireframes<br />
  61. 61. Prototypes<br />
  62. 62. Usability Engineering in SDLC<br />Step 4 - Monitoring & Control<br />People<br />Process<br />Technology<br />Monitoring &Control<br />Initiating<br />Planning<br />Closure<br />Execution<br />Closure<br /><ul><li>Peer Review
  63. 63. Expert Review
  64. 64. Heuristic Evaluation</li></li></ul><li>Peer Review<br />
  65. 65. Expert Review (Subject Matter Experts)<br />
  66. 66. Heuristic Evaluation<br /> Heuristic evaluation is the most popular of the usability inspection methods. Heuristic evaluation is done as a systematic inspection of a user interface design for usability. The goal of heuristic evaluation is to find the usability problems in the design so that they can be attended to as part of an iterative design process. Heuristic evaluation involves having a small set of evaluators examine the interface and judge its compliance with recognized usability principles (the "heuristics"). <br /> By Jakob Nielsen <br />1. Visibility of system status <br /> <br />2. Match between system and the real world <br /> <br />3. User control and freedom <br /> <br />4. Consistency and standards 5. Error prevention . <br />6. Recognition rather than recall <br />7. Flexibility and efficiency of use <br /> <br />8. Aesthetic and minimalist design <br /> <br />9. Help users recognize, diagnose, and recover from errors<br /> <br />10. Help and documentation <br />
  67. 67. Thank you<br />Presented by: Sivaprasath Selvaraj<br />

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