1. Ch 1 Second Half What is a Language?
System of Symbols
Definition of Vocabulary
Grammar
Set of semantic rules.

2. Advent of Graphical User Interface (GUI)
Idea that software was a Tool
Includes Tools, Tool Boxes, Tool Bars
Notion of direct manipulation of the encoded artifacts in the GUI
Affordances
The world is perceived not only in terms of object shapes and spatial relationships but also in terms of object possibilities for action (affordances) – perception drives action.
Presence of intended meaning direct manipulation.
p10

3. Communication of the Designer’s message
Affordances were themselves used as Metaphor (instead of a technical concept)
Metaphor intended meaning
 designer meant
 interface elements meant to say
Issues about how the designer’s intent was
Encoded
Decoded ( Interpreted)
Epistemic Tools – tools that help with new knowledge

4. Three Applications with new knowledge
WinVi – basic text editor
Treemap – visualization tool for data as structures & nodes
Adobe Acrobat – reviewing documents

5. Tree Maps See Page 13

6. Shneiderman’s eight golden rules
Strive for consistency.
Enable frequent users to use shortcuts.
Offer informative feedback.
Design dialogs to yield closure.
Offer error prevention and simple error handling.
Permit easy reversal of actions.
Support internal locus of control.
Reduce short-term memory load.

7. Telling users about the design vision
HCI
Producing Technology
Semiotic Engineering
Introducing Technology.
Understand aspects of technology instead of only learning how to operate.

8. Semiotic Engineering Example:
Highlight and add note Vs. Comment-on-highlight strategy by changing preference parameter.
User must see operations that open avenues for alternative strategies.

9. Semiotic Engineering
Characterize interactive computer application as meta communication artifacts.
Communicate a message about communication itself.

10. Four stages Evolutionary schema
The designer studies users, their activities and their environment;
The designer expresses, in the form of computer technology, his views about how the users, their activities and environment may or must change (because users so wish);
Users unfold the designers message through interacting with the system; and
Users finally make full sense of the designer’s message and respond to it accordingly.
P 24

11. 1.5.3 Consequences of Having Homogeneous Models
Users Designers Semiotic Engineering becomes a reflective theory.
Same communication

12. Different Possibilities
Structuring the solution space
Exploring alternative solution
Possibilities stem from
knowledge about Signification & Communication phenomena
Relationship with culture and computer technology

13. HCI signification system engineering
Used to communicate with users via designer’s deputy
(Deputy is the system)

14. Signification system engineering
Used to communicate with users via designer’s deputy
(Deputy is the system)