preposition

by

used to show the person or thing that does something

• A painting by Van Gogh

for

intended to be given to or used by someone or something

• I’ve bought a few clothes for the new baby.

with

used to say that people or things are in a place together or are doing something together

• Emma lives with her boyfriend.

Re-definition

The prepositions; by, for, with are leader keywords of the design thinking process. A designer need to be aware of who he/she design for, what he/she design with and how he/she design by.

Engineers still tenant believe in logic. They often explain to me in great, logical detail, why their designs are good, powerful, and wonderful. “Why are people having problems?” they wonder. “You are being too logical,” I say. “You are designing for people the way you would like them to be, not for the way they really are.”

Don Norman – The Design of Everyday Things