"Inform is a design system for interactive fiction ... In place of traditional computer programming, the design is built by writing natural English-language sentences"To make sense of it I had to read Chapter 2 of the Help. My initial unguided effort of "The cat sat on the mat" produced an image of broken cogs and a problem analysis. The Help explains that you have to create a world first by teaching the program where and what everything is using assertion statements in the present tense:
The cat is an animal."The cat sat on the mat" still doesn't work but I'm getting there.
The bathroom is a room.
The mat is in the bathroom.
Some analysis at the psychology of planning interest group:
Here is a quick start, from Brian Slesinsky: