week 8

what are requirements?
-statement about an intended product that specifies what it should do or how it should perform.
-should be specify,unambiguos and clear as possible
-ex : time to download any complete web page is less than 5seconds vs teenage girl should find the site appealing.
- must know how to tell when they have been fulfilled.
 
types of requirements :
functional requirement
    -what the system should do
    -ex : word processor should support a variety

interaction design :
-functional requirement
-data requirement
-environmental requirement
-user characteristic

fucntional requirement:
-capture what the product should do.

data requirement:
-capture the type,volating,size/amount,persistance,accuracy,and value of requirred data.
ex: share-dealing application.

environmental requirement/context of use :
the circumstance in which interactive product will be expected to operate.

-four characteristic of environmental requirement :
=physical environment
=social environement
=organisational environment
=techinical environment

user characteristic :
-capture the key attributes of the intended user group.
   =user abilities and skills,users nationality,educational background,preference,personal circumstances.physical or mental disabilties
  =the collection of attributes for a typical user is called a user profilee.
  =any one product may have a number of different user profiles.
  =to bring user profiles to life,they are turned into a number of personas
  =personas are richn description of typical users of the product under development that the designer can focus on design the product for. they dont describe real people but are synthesized a number of real user sho have been involved in data gathering exercised.

usability goals
-effectiveness.efficiency,safety,utilit -> user preferences

user experienced goals
-fun,enjoyable,pleasurable..aesthetically,pleasing and motivating -> user's perception