| Edition 1 - 1975 |
Edition 2 - 1978 |
Edition 3 - 1979 |
Edition 4 - 1996 |
Edition 5 - 2001 |
| | Be less critical more often | Be less critical | Be less critical more often |
| | Go to an extreme, move back to a more comfortable place | Go to an extreme, come part way back | Go to an extreme, move back to a more comfortable place |
| | Once the search is in progress, something will be found | Once the search has begun, something will be found | Once the search is in progress, something will be found |
| | Would anybody want it? | Would anyone want it? | Would anybody want it? |