“Much has been written about this subject but for the uninitiated this taking of oral evidence (usually from experts) ‘hot tub’ style, means having expert witnesses being questioned and cross-examined together – firstly by the judge or arbitrators and then by the parties’ representatives themselves – and indeed even by each other! Known in polite circles as concurrent evidence, hot tubbing can be used to great effect in construction related disputes, such as those involving design and build issues, measurement disputes, delays, and financial loss.”
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Hardwicke Chambers, 7th January 2013
Source: www.hardwicke.co.uk