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L6a: Usability - Part 1 (Part 2 … case studies)

L6b. Review of Homeworks (next slides)

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Status … about class demos

JDev in labs … reported to be fixed JDev wireless + off-campus …still pending (KSU firewall blocks Oracle port , why so slow to change that ??? )

JDev to develop DB tables: http://www.oracle.com/technology/products/jdev/index.html Tutorials Database development http://www.oracle.com/technology/obe/obe1013jdev/10131/ database%20development/obe_%20dbasedevmt.htm

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Usability …

a measure (a ranking or quantitative assessment) of user satisfaction and performance in using an interface (web, application UI, or service API)  for an application or service.

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includes:     

function (functionality)    ... the use-cases ,        appearance           ........... the "look and feel",                                                        ( readable, simple:  7+-2 )      operation  ........................ the required behavior of the user and the behavior of the application                                                      (speed … how fast users complete transactions, … how fast system completes operations, navigation,  conceptual/visual model,  intuitiveness )                                                      

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metrics:

     measure user speed,     Likert measures of factors ( ease, navigation, readabililty, ...) with statistical analysis          http://en.wikipedia.org/wiki/Likert_scale

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Why important?

1.  usability will dominate the success/rejection of the application.

2.  presentation & usability team  typically same effort as the model implementation !!       est. 10% of design budget  == usability

often a different “kind” of person: less technical, more user oriented: eg background in psychology, graphic arts

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Refs:

Usability.gov  ... http://www.usability.gov/basics/

Nielson  Usabiltiy 101   http://www.useit.com/alertbox/20030825.html Nielson:  Ten Heuristics  http://www.useit.com/papers/heuristic/heuristic_list.html

more links  http://www.usableweb.com/

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User-centered design:  usability integrated with the requirements and design steps. awareness of usability guidelines and patterns.        awareness of interaction patterns:               navigation, selection, draging, etc.        user advocate on design team        analysis of user domain:   roles,  conceptual models,  specific tasks, user personas         use of prototypes:   often visual mock-up  (Story boarding)                                      or state-machine simulator          together with user observation & analysis (Usability labs, video & timed)

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consider your homework page: user view ( the instructor): what purpose? what usability features?

producer view (you): what purpose? what usability features?

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consider your homework page: user view ( the instructor): what purpose? an index to homework items, identification of items & author, by date

what usability features? Firefox & IE (browser independence) loads fast … minimal images, etc minimal scroll (compact, not large font) student name + item names stable record

… some examples follow = = = =>

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.

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end.

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end.

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.

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student goals:

grades reported …. Name in URL or page permissions set

security …………….

included an empty index.html prevents directory browsing to find homework items

In public_html directory included a robots.txt file disallow crawling robots to index the homework directory

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A

B

D

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end.