added studynotes.txt

git-svn-id: svn://anubis/gvsu@474 45c1a28c-8058-47b2-ae61-ca45b979098e

cs623/notes.txt

@@ -60,7 +60,7 @@ Chapter 2.3 - Interaction Styles
   - visual representation of domain objects
   - direct action on objects
   - immediate and visible effects
-  - reversable actions
+  - reversible actions
 6. Metaphors
 7. Natural Language
 

cs623/studynotes.txt

@@ -0,0 +1,78 @@
+5. Direct Manipulation ("point and select")
+  - visual representation of domain objects
+  - direct action on objects
+  - immediate and visible effects
+  - reversible actions
+
+Discount usability engineering
+  - a quick-and-dirty approach
+  - basic premise: designs change substantially in early development phases
+  - make a prototype that shows UI to get feedback early on
+  - perfection is not cost effective
+  - test early and often
+  - how to do
+    1. scenarios
+      - task analysis
+      - prototyping - partial
+        - use paper & pencil or simple tools
+    2. simplified thinking out loud
+      - use 3-6 real users
+      - ask user to think out loud while performing given tasks
+      - collect data by note-taking
+
+  User Analysis
+    - learn by recognition, not recall
+    - remember things in related groups
+    - have different ways of learning and communicating
+    - like to be in control
+
+    pre-experience, such as KLM (Keyboard Level Model)
+      provides numerical prediction of user performance
+      primitive operations
+        - physical actions
+        - mental preparation
+        K = 0.35 sec (hit key on keyboard, press button on mouse)
+        P = 1.1 sec  (point - move mouse to position)
+        H = 0.4 sec  (homing - move hand b/w kbd & mouse)
+        M = 1.35     (mental preparation time)
+        R =          (responding - time for computer to respond)
+      rules for using the M operator
+        1. point and click (MPMK) => MPK (it is one cognitive unit)
+        2. menu selection (MPK [File] MPK [Save]) => MPK PK (File on way 2 goal)
+        3. typing (MK 'n' MK 'o' MK 't') => MKKK
+        4. typing a terminator (MK 'a' K '.' K 'enter') => MKKK (bring closure)
+      what KLM doesn't do
+        1. errors
+        2. learning time
+        3. recall
+
+Usability:
+the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction  in a specified context of use
+
+Visibility:
+Making the user aware of the system’s components and processes, including all possible functionality and feedback from user actions.
+Reduce memory load
+Recognition/Recall
+the principle of visibility is based on the fact that we are better at recognition than we are at recall
+
+User testing
+Users were videotaped and timed when performing increasingly complex tasks
+Captured data including time taken, errors, help accessed, and task steps missed
+
+Heuristic evaluation
+Identify an interface error by predicting user problems it will cause
+Good at finding poor terminology and lack of clarity
+Ten heuristics are inadequate as a guide
+A subjective process
+
+End user testing
+Identify the symptom and infer its cause
+Good at finding problems while performing real tasks
+Task-based 
+May miss features not encountered in tasks 
+Users tend to blame themselves rather than the interface
+
+Both techniques share the same goals, but the actual results are quite different 
+End user testing indicates the symptom of a problem
+Heuristic evaluation identifies its cause
+Heuristic evaluation helps analyze observed problems. But observation of novices is still vital as many problems are a consequence of the user’s knowledge, or lack of it.