1.   Their decisions were based on data of doubtful accuracy.

2.   He based his decision on facts, not emotions.

3.   Traffic-management decisions might be based on firm knowledge of vehicle responses to instructions,rather than on guesses about the choices that drivers might make.

4.   Gore stated that his decision was based not upon political considerations but personal issues, particularly the welfare of his family.

5.   There is now a much greater difference between the probabilities of success and failure on which to base a decision.

6.   Judges sat behind closed doors and took only written evidence, basing their decisions on the records of preliminary investigations conducted by the police.

7.   The decision was based primarily on the risk of contamination to the South Yorkshire aquifer, which has no shield of impermeable clay.

8.   The decision was based on two grounds.

9.   His decision is based on bitter experience.