Preposition: of

• vaccine: Badger TB vaccine trial launched A £ 1m field trial of a vaccine to combat tuberculosis in badgers has been launched by the government.

Converse of object

• undergo: He has already produced prototypes of a device - currently undergoing field trials in Germany - that looks set to provide a solution.

• complete: At the moment the project has just completed initial field trials and it is not available for purchase yet.

• design: Design A field trial comparing an intervention and control group over three years.

Adjective modifier

• initial: At the moment the project has just completed initial field trials and it is not available for purchase yet.

• further: Further field trials have been performed on newer models of alarm, the results of which will be published by HSE later this year.

• preliminary: Following on from the success of these tests, further performance tests and preliminary field trials are proposed for phase two of the study.