His decision to bring on Milner against Real Madrid in the Champions League again didn’t prove too fruitful, and the damage was done at that stage.
Away at West Ham he took off Tevez and brought on Javi Garcia which removed any threat City had of scoring.

At home against Sunderland last season Mancini brought on Pizarro at 1-3 and he did stabilise the midfield allowing a more central attacking trio, but it should never have come to Sunderland leading by that margin.

If he got his tactics correct from the first whistle then he might not need to alter so much during the course of the game.

Seemingly he becomes more tactically astute towards the end of the games, rather than at the start! (Ajax away, etc..)

A stimulating article all the same Neil.