Hi

while looking this picture,

Cost of changes Graph or Progrssing line or Trend of cost of change or Nature of curve, -- Is it correct?

It might be caught by financers or certain analysts.

It is not important for passing exam, but it is worth to discuss for such a reputed standard and institute.

Cost of changes - it is a cumulative graph, and it is true that it will be incremental with the project time passed.