In Doug’s Capability Infrastructure Diagram the human system and the tool system are clearly shown as vertical columns with lines connecting in myriads of ways to create capabilities in the centre. For example, a tool system capability to ‘copy’ will only be useful if the user knows how and why to carry out the command.
What is missing from the diagram though are two things though: The technical infrastructure and the symbol space.
The technical infrastructure is document formats and network protocols. This is what either allows tools to give the user certain capabilities or constrain them. For example, the user cannot create a citation link to a specific section of a commercially bought and copy protected book, unless the vendor opens the software to allow this type of tool use.
The second issue is harder to explain and define and I’ve decided to name it the ‘Symbol Space’. What it entails is more on the Marshall McLuhan media side of things, it’s about the digital media; what it can enable–what the opportunities are and what the constraints are. The basic notion is that what a human manipulates thorough the computer is symbols.
This is where issues of symbol manipulation, view specs and high-resolution addressing comes in.
These are ‘things’ which can be implemented in technology, or ‘instantiated’ in many different ways, depending on what the infrastructures allow for. This is one thing I wish I had the opportunity to discuss with Doug.
I have put up symbolspace.info as a place to investigate this further from.