By just looking at the doors in those pictures, you cannot tell whether to push or pull to open the door. This is a bad design. Products people I use shoulda be very simple and people should know how to use it by just looking at it. That concept is very important in the product design.

People do that their guts tell them to do. "Push" or "Pull" ... If you need a instruction, the door is designed poorly. Same for the software. If you designed well, there is no need for an instruction. People do what people do. We need to understand ourselves and design the software accordingly.

今日はユーザーインターフェイスのお話をします。例えば上記のようなドアがあったとします。左のドアには四角い板が張られていて、右のドアには縦に持つところがあります。このドアを見て人は左のドアは押したら開くと思います。そして右のドアは取っ手をもって引っ張って開けようとすると思います。 もしこれが逆だったら...