Living Space / Environmental 
| The Logic Alphabet Project | The task of constructing the Logic Alphabet is part of a longstanding project initated by Zellweger. This project comes under the general area now called "sign factors engineering." It could also be called "cognitive ergonomics." |
| Aust Think.org | Austhink is a critical thinking research, training and consulting group specializing in complex reasoning and argumentation. |
| Reazon!able | Reasonable is the award-winning, revolutionary new software for reasoning. |
Living Space / Environmental