CIS 764 Database Systems EngineeringSlide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Fall 2007 http://www.cis.ksu.edu1CIS 764 Database Systems Engineering L14: Usability - Part 2 : examples, About Presentations (beginning slides are copied from L6a)Fall 2007 http://www.cis.ksu.edu2CIS 764 Database Systems EngineeringUsability … 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. “good”, “nice” are not measures ! “number of ..”, time, Likert scale… are measures.Fall 2007 http://www.cis.ksu.edu3CIS 764 Database Systems Engineeringincludes: 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 applicationFall 2007 http://www.cis.ksu.edu4CIS 764 Database Systems Engineering Why important?1. usability will dominate the success/rejection of the application.2. presentation & usability team typically UI design = same effort as model implementation !! 10% of UI design == usabilityFall 2007 http://www.cis.ksu.edu5CIS 764 Database Systems Engineering 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/ books old The Design of Everyday Things, (Norman) 2001 Homepage Usability: 50 Websites Deconstructed (Nielsen) 2000 Designing Web Usability: The Practice of Simplicity (Nielsen) current … $$$ for usability reportsFall 2007 http://www.cis.ksu.edu6CIS 764 Database Systems Engineering Your usability evaluations: seeking e-commerce-like sites (user interaction to a back-end DB) seeking some bad site, some good site. (many found both bad and good at same site)Fall 2007 http://www.cis.ksu.edu7CIS 764 Database Systems Engineering Amazon, Yahoo, Monster Orkut (2), Digg.com Google, Yahoo Gmail, KSU webmail NY Times, Manhattan Mercury, KSU Collegean CIS540 HP(3), Dell (2), Sony, IBM(2), BEA, Microsoft, CircuitCity Verizon espnStar ING Stonybrook U from India: rediff, indicthreads, naukri KeyPoster, LongCycle, Durlston, ocgov deal2buy, slickDeal, JustDeals whattheboat, latex-project dzinerHolidays ChilpotleFall 2007 http://www.cis.ksu.edu8CIS 764 Database Systems Engineering Good features: layout .. simple fast (simple) easy rich personalFall 2007 http://www.cis.ksu.edu9CIS 764 Database Systems Engineering Good features: “good” organization / layout (5); standard layout (bbb); organization by user roles; Nielson’s features fast (2): no ads easy navigation: rich functions, drop down selection, good search (spelling); tutorials; rich functions: dynamic update ( usually Ajax) data mining … customer helps personal profile data mining … customer helps multi-language … select non-english auto-region detect …Fall 2007 http://www.cis.ksu.edu10CIS 764 Database Systems EngineeringBad features:(layout) complex layout (4); complex lists of items; color clash, icon visibility(fast) big ads, blinking, clutter, many ads, useless flash(easy) long navigation, numeric user id, multiple register(rich) hides the cost (2), no product reviews missing feature (fwd email) weak search; no search feature(bad) bad links not cross-browser incomplete drop down list security breach not Nielson featuresFall 2007 http://www.cis.ksu.edu11CIS 764 Database Systems Engineering Class web evaluation pages: ... No name (many) … non-active links (text, but no link) … several … no images ! …. few vs too large images … many vs bad link to image … few … did not answer the question: “what good / bad feature” … few … spelling errors … severalFall 2007 http://www.cis.ksu.edu12CIS 764 Database Systems EngineeringNielson 2000, Top ten mistakes:1. Bad search2. Pdf files3. Color of visited links4. Non-scannable text5. Fixed size fonts6. Weak page titles7. Ads8. Violating design patterns9. Opening new windows10.Not answering key questions (like price)http://www.useit.com/alertbox/Fall 2007 http://www.cis.ksu.edu13CIS 764 Database Systems EngineeringBad features: How can this be? What is the answer? Is the state of software quality any different from the state usability? Ans:Fall 2007 http://www.cis.ksu.edu14CIS 764 Database Systems EngineeringBad features: How can this be? * GUI design by programmers. * Test / evaluation by the designers. good for the business =/= good for user natural difference in preferences What is the answer?Fall 2007 http://www.cis.ksu.edu15CIS 764 Database Systems EngineeringBad features: How can this be? * GUI design by programmers. * Test / evaluation by the designers. What is the answer? follow established standards * (Nielson) visual prototypes [if necessary, mock back-end data] * user personas (and real users) * patterns (of domains & interactions) * usability testing labsFall 2007 http://www.cis.ksu.edu16CIS 764 Database Systems EngineeringDoc Searls : used to sell many books his site linked to Amazon for fulfillment. changed site to link to Wordsworth for fulfillment …. sold zero single books !!Why?Fall 2007 http://www.cis.ksu.edu17CIS 764 Database Systems EngineeringDoc Searls : used to sell many books his site linked to Amazon for fulfillment. changed site to link to Wordsworth for fulfillment …. sold zero single books !!Why? users do not want to learn any new interface Wordsworth violated guidelines for ecommerce: - bag vs cart - “add to bag” gives no feedback - cannot find the “checkout” link (all these have been changed)Fall 2007 http://www.cis.ksu.edu18CIS 764 Database Systems Engineering Response times: 0.1 sec .. Interaction OK, no other feedback 1.0 sec .. Not direct interaction, but no other feedback 10 sec .. OK wait time with feedback longer … user will multi-task to other windows.Fall 2007
View Full Document
Unlocking...