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Principle - or fashionable heuristic?

Information architecture (IA), user experience (UE) and (formal) usability have much in common. If we wanted to define them in inter-related terms, we might say something like the following:

• Information architecture - an approach (qua suite of tools; body of lore; toolkit of techniques and methods, and so on) for doing...
• User-experience design - which is a body of practice whose aim is to ensure that what is maximised in any given system or product is...
• Usability - which is a quality of systems and products that measures the extent to which users of those systems or products can achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use

Hmm. Yes. I know, there are layers upon layers of complexity here. Shall we do some gentle disambigutation together?

Classification	Interactive design patterns
Methodology	UCD deliverables
UCD principles	Web design mistakes
What is IA?	What is UCD?
What is usability?