ch10.ppt
- 1. Copyright 2006 - John Wiley & Sons, Inc Chapter 10 Componential Design HCI: Developing Effective Organizational Information Systems Dov Te’eni Jane Carey Ping Zhang
- 2. Copyright 2006 - John Wiley & Sons, Inc Learning Objectives Know some of the popular HCI components Understand how to select and design components Learn how to apply HCI design guidelines to the design of HCI components. Learn how to apply the TSSL model to any HCI component.
- 3. Copyright 2006 - John Wiley & Sons, Inc Roadmap 6 Affective Engineering 9 Organizational Tasks 4 Physical Engineering 7 Evaluation 8 Principles & Guidelines 11 Methodology 12 Relationship, Collaboration, & Organization 10 Componential Design 3 Interactive Technologies 5 Cognitive Engineering Context Foundation Application Additional Context 1 Introduction 2 Org & Business Context 13 Social & Global Issues 14 Changing Needs of IT Development & Use
- 4. Copyright 2006 - John Wiley & Sons, Inc Evaluation Metrics Dialogue Design Metaphor Design Analysis Design HCI Principles & Guidelines Implementation Formative Evaluation Summative Evaluation Coding User Needs Test Requirements Determination Project Selection Project Planning Project Selection & Planning Alternative Selection Media Design Presentation Design Formative Evaluation Formative Evaluation Interface Specification Task Analysis User Analysis Context Analysis Componential Design and HCI development
- 5. Copyright 2006 - John Wiley & Sons, Inc Introduction Most designers build human-computer interfaces by assembling ready-made components. The components are assembled into an input-output design that serves some function such as presenting information to the user, enabling navigation, and accepting information from the user who is engaged in performing a task.
- 6. Copyright 2006 - John Wiley & Sons, Inc Introduction We use the four-layer TSSL (task, semantics, syntax and lexicon) model of interaction that translates the abstract function to the physical building blocks. However, to avoid confusion, the term ‘task’ is reserved for describing the task as the user sees it and the term ‘function’ (or functionality) will be used to describe the designer’s description of what the component does.
- 7. Copyright 2006 - John Wiley & Sons, Inc Introduction Components are the building blocks with which we construct the human-computer interface. Functions (functionality) are the component’s services to the user.
- 8. Copyright 2006 - John Wiley & Sons, Inc Component Functions Color Differentiate data items, group elements, signal order and meaning, impact mood Voice Convey meaning and emotion, signal importance, instruct tools Text Convey meaning and emotion Video Convey meaning and emotion; display dynamic behavior Table 10.1.a: Low level components – the infrastructure
- 9. Copyright 2006 - John Wiley & Sons, Inc General function Description of function Specific interface objects Data input & feedback Input data by selecting from predefined values or generating new values Selection: Radio button; check box, list box. Generation: textbox, message box for feedback, specific dialog boxes Navigation controls & feedback Control the inter-system and intra-system flow and user navigation Menu, command buttons, dialog box Quantitative graphics Output quantitative information Graphics (bar-charts etc.), tables Table 10.1.b: Medium level components
- 10. Copyright 2006 - John Wiley & Sons, Inc Function Components Input information about some entity Form fill-in Output information about some entity Output screen Search and browsing Query screen Decision making What-if screen Navigation and control within some website; introduce a site Homepage (also menu); Multiple windows Table 10.1.c: High level components – assembling lower-level components
- 11. Copyright 2006 - John Wiley & Sons, Inc Low-level components (infrastructure) Color Color in HCI is used extensively. Color calls attention Color helps comprehension Color adds cues Color is appealing Color facilitates recognition, attention, memory, comprehension and positive affect.
- 12. Copyright 2006 - John Wiley & Sons, Inc Color Figure 10.2: Dialog box to define color
- 13. Copyright 2006 - John Wiley & Sons, Inc Guildelines for use of Color Two general design guidelines First, allow for redundancy so that differentiation by color is also accompanied by differentiation by shape or size. Secondly, whenever possible, empower the user to adapt colors to fit their preferences and their culture.
- 14. Copyright 2006 - John Wiley & Sons, Inc Medium level components Data input The main design objectives of data input are to ensure correct input with minimal user effort There are two general methods of inputting data: User generation of data values User selection of data values
- 15. Copyright 2006 - John Wiley & Sons, Inc Data input - the building blocks The common building blocks (widgets) for selecting symbolic values include radio buttons check boxes list boxes
- 16. Data input - the building blocks Figure 10.3: Screen with check box, radio buttons, command buttons, text boxes and list box.
- 17. Copyright 2006 - John Wiley & Sons, Inc The syntactic and semantic levels of Data Input components Widget Function Guidelines Formatted (coded) fields Enhance clarity of what is expected; prevent errors and guide specification of input; ease input Use meaningful labels adjacent to the data entry field; the data entry field should be clearly visible and match the expected value in format and size; recognizable but restrictive formats when possible; provide explanations nearby the data entry field; provide constructive feedback upon incorrect input; use defaults when possible (e.g., common or personalized value) List box Display values and help select Order values in obvious sequence (e.g., alphabetical); provide explanation of the list values or categories Radio buttons Display values to enable holistic view and easy choice Organize values to enable parallel view of all options (e.g., order categories in increasing ascending value); provide explanation of the values or categories
- 18. The Task level – data input and choice Input circumstances Main concerns Widgets recommended Possible values known; several values allowed. Recall and specification is difficult and accuracy of input is crucial (e.g., areas of interest for marketing purposes). Check box for limited number of values. Possible values known; one value allowed. Free form specification may be ambiguous and accuracy of input is crucial (e.g., spelling of country name). Radio buttons for few possible values. List box for multiple values (ordered if possible). Possible values known; one value allowed. Choice of value depends on comparison with other options (e.g., exact marital status on tax form). Radio buttons to display simultaneously the possible values. Possible values unknown; free form alphanumeric input expected. In some cases, specification of input is difficult. Text box with short labels when specification is straightforward and additional constant labels or popup message boxes to help with ambiguous or difficult specification. Possible values unknown; some predefined restrictions. Free form specification may be ambiguous and accuracy of input is crucial (e.g., phone number with area code and country code). Formatted input box with message box as feedback to validate input.
- 19. Copyright 2006 - John Wiley & Sons, Inc Navigation and flow control Navigation mechanisms Menus Command controls Dialog controls
- 20. Copyright 2006 - John Wiley & Sons, Inc Navigation and flow control Figure 10.4: A control panel consisting of a horizontal menu and two rows of icon-based command controls.
- 21. Navigation and flow control Figure 10.5: Navigation in an e-book uses a clickable image-based menu and a corresponding vertical menu.
- 22. Copyright 2006 - John Wiley & Sons, Inc Navigation and flow control Figure 10.6 shows two overlapping dialog boxes.
- 23. Copyright 2006 - John Wiley & Sons, Inc Menus and navigation - the syntactic and semantic levels In tree structured menus the main design issues are: Breadth-depth tradeoff Organization of menu items Sequence of menu items and Graphic layout.
- 24. Copyright 2006 - John Wiley & Sons, Inc Menus and navigation - the syntactic and semantic levels Effective choice of semantics is crucial for correctly and efficiently locating an item. Familiar and unambiguous terms are key to recognizing and interpreting the labels of the menu items. The main application text-based menu is commonly positioned at the top of the screen horizontally. By convention, more specific menus are positioned vertically on the left hand side. Icon-based menus are arranged in a two-dimensional space to be read left-to-right and top-down by infrequent users.
- 25. Copyright 2006 - John Wiley & Sons, Inc Figure 10.7 is a typical youngster’s self constructed icon-based menu. Menus and navigation - the syntactic and semantic levels
- 26. Copyright 2006 - John Wiley & Sons, Inc Menus and navigation - the task level Menus support several types of user tasks, all related to navigation and control. Once an intention has been formed, the user has a search target in mind.
- 27. Copyright 2006 - John Wiley & Sons, Inc Menus and navigation - the task level There are three types of searches in menus: 1) matching the search target with an identical menu-item label 2) locating the category that includes the search target 3) finding a label that is equivalent (but not identical) to the search target
- 28. Copyright 2006 - John Wiley & Sons, Inc Quantitative graphics In recent years, graphics have played an increasingly important role in managerial work, primarily in decision-making and communication. The increasing importance of graphics is, at least in part, due to the amazing graphical power that is found in today's graphical packages and the affordability of high quality screens, printers and plotters.
- 29. Copyright 2006 - John Wiley & Sons, Inc Why use computer graphics? 1. Graphics are effective communicators for most types of quantitative information. 2. Computer generated graphics are low cost alternatives to manual charts (think how easy it is to construct a high quality chart in most commercial spreadsheets). 3. Computer generated graphics readily access corporate databases. 4. Computer generated graphics help interactive decision-making.
- 30. Copyright 2006 - John Wiley & Sons, Inc Table 10.5: Graphics versus text Lexicon Text composed of words in clauses within paragraphs. Images composed of shapes. Syntax Procedural – processes as sequence of elements. Holistic – process as a unit with parallel relations. Semantics Functional, logical and abstract relations. Spatial built on proximity, ordering and direction. Quantitative graphics
- 31. Copyright 2006 - John Wiley & Sons, Inc The building blocks for representing quantitative data (the graphic’s lexicon) include labels and numeric data represented by spatial elements such as lines, angles, circles, boxes etc. Graphics - the building blocks 0 5 10 15 20 25 30 35 40 45 Dollars Pentium III Pentium IV Laptop Pentium III iMac Quarters of 2005 Title should convey a message in the graph Company 1 Company 2 Figure 10.8: A 3D bar chart, representing quantitative data with a title, grid, legend and labels.
- 32. Copyright 2006 - John Wiley & Sons, Inc . Decision-making aspect Psychological resources supported by graphs Problem finding Detection, attention Information analysis Comprehension, memory Performance review Detection, attention, comprehension, affect Forecasting Detection, comprehension Exception reporting Detection, attention Planning Memory, comprehension, attention Exploratory analysis Detection, attention, comprehension Simulation Memory, comprehension, attention, affect Table 10.6: Resources needed in decision-making that graphics support
- 33. Copyright 2006 - John Wiley & Sons, Inc Five basic graphs for business presentations: pie chart bar chart column chart (vertical bar charts) line chart dot chart Graphics The Task level - decision-making and communication
- 34. Copyright 2006 - John Wiley & Sons, Inc A three-step strategy for chart selection: 1) determine your message - a single point to be made, 2) identify the comparison (out the five types), and 3) select the type of chart. Graphics The Task level - decision-making and communication
- 35. Copyright 2006 - John Wiley & Sons, Inc Graphics -The Task level Company 1 34% 30% 31% 5% Pentium III Pentium IV Laptops P iMac Company 2 20% 27% 43% 10% Distribution of computers in company Distribution of computers in company 0 20 40 60 Company 1 Company 2 iMac Laptops P Pentium IV Pentium III Distribution of computers in company 0% 20% 40% 60% 80% 100% Company 1 Company 2 iMac Laptops P Pentium IV Pentium III Computer distribution 0 50 Pentium III Pentium IV Laptops P iMac Company 1 Company 2 Distribution of computers in company 0 10 20 30 40 50 P e n t i u m I I I P e n t i u m I V L a p t o p s P i M a c Types Computers Company 1 Company 2
- 36. Copyright 2006 - John Wiley & Sons, Inc Form Design One common design technique is to build a form that includes all the relevant information about a particular entity (like an order or a person) – this is called a form fill in. Its main advantages lay precisely in the full view of the relevant information to be entered into the computer system.
- 37. Copyright 2006 - John Wiley & Sons, Inc Form Design Figure 10.13: Initial design of patient form fillin
- 38. Copyright 2006 - John Wiley & Sons, Inc Form fill in - the building blocks Form fill ins are high-level components that are in fact assemblies of lower-level components. The main building blocks of the form fill in include: components for accepting and selecting data feedback and organizers
- 39. Copyright 2006 - John Wiley & Sons, Inc Form fillin - the syntactic and semantic levels Figure 10.14: Redesigned patient registration form for better balance.
- 40. Copyright 2006 - John Wiley & Sons, Inc Form fill in - the task level The task supported by a form fill in is simply feeding data into the system. A person requesting a service or product can either fill in a form directly or indirectly through an operator.
- 41. Copyright 2006 - John Wiley & Sons, Inc The cost of erroneous data in the system is high for both the individual and the company. Detecting and correcting errors that have entered the system is extremely costly. Good HCI designs of form fill ins are those that above all reduce error and minimize effort. Form fillin - the task level
- 42. Copyright 2006 - John Wiley & Sons, Inc Summary We have enumerated several HCI components but many others exist We looked at low-level components such as color and higher-level components such as menus and form fillins In all cases, we examined each component through the TSSL model (task, semantic, syntactic and lexical levels). This model helps to relate the user’s task to its implementation in human-computer interaction. It lays the basis for examining the impact of a component on the user’s cognitive and affective processes, and, thereby, on overt behavior.
- 43. Copyright 2006 - John Wiley & Sons, Inc Summary We also applied some of the HCI guidelines elaborated in the previous chapter to the design of specific components. The most important message however throughout the chapter is the strive to fit the component to the task at hand.