Chuckrox

1st example Pg 205 is an actual performance attribution where you look at sources of return .This is an overall decomposition ( essentially single period )
Second one Pg 213  is an example of multi-factor, muli-period retrn attribution . It is just an illustration of the multi-period attribution calculation , don’t take it to the bank to encash into sources of return.
It could have been any other factors in Pg 213 such as Value Manager & Growth Manager ,or Small Caps and Large Caps . You would proceed wih the bmulti-period calc exactly the same way but to get explanation for different factors.