The Appreciation Index or AI is a measure of how much the audience enjoyed the programme. The score, out of a hundred, is compiled by a specially selected panel of around 5,000 people who go online and rate and comment on programmes.
The score of 83 is slightly below Doctor Who's usual average, but is the second highest score of this series yet. The AIs for the series so far are as follows:
- Time Heist & Into the Dalek - 84
- The Caretaker - 83
- Deep Breath, Robot of Sherwood & Listen - 82
[Source: Doctor Who News]