When people evaluate others' performance or attribute motives and causes, they illustrate their claims with relatively directly observable data (what was said or done), invite inquiry and encourage testing, rather than making unillustrated, untestable assertions. Argyris's CIO asked his staff what the line managers had said or done that led them to conclude they did not know what they wanted, rather than asking why, and whether the assumption had ever been tested with them; Argyris scores conversation on whether each evaluation, attribution or piece of advocacy carries an illustration, an invitation to inquiry and a test.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.