A sub-characteristic of interaction capability in the product model and of satisfaction in the quality-in-use model. It describes how far appropriate information about the system reaches the people who need it: what it does, how it is built, its interfaces, the models, the training and evaluation data, performance benchmarks, logs and the management practices behind it. Records and introspection are part of the quality, not an afterthought, because they make investigation and impact assessment possible.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.