According to Slides from Andy in class, There is an important standard.
A framework for design:
P: (People) —physical differences／ psychological differences ／usage differences
A: (activities)—temporal aspects／ cooperation／complexity／safety critical／the nature of the content
C: (Contexts)—physical environment ／social context ／organisational context
T : ( technologies)—input／output ／communication／ content
P (people): Simple language, visual, icons, fun, curious, color, motor skills (not fully developed), intellectual, parents(indirect）
A (Activities): outdoor activities, forecast, remind weather, clothing, games( animation) , learning weather, No-into the future, communication.
C (Contexts): social, share, learning, physical environment.
T (Technologies): Iphone/ Ipad, gestures, GPS, location, sound (not suit for kids)
Tips: shown in bold should be attention!
All in all , these are important principles to consider the user experience and design a good product.