The use of party appointed experts in international arbitration, as with domestic litigation, is widespread. However, their use too often comes at a significant expense, bringing challenges of partiality and ineffective deployment in proceedings. This article discusses leading international case management techniques in respect of party appointed experts, with a particular focus on methods addressing bias in party appointed expert evidence in domestic common law courts and international arbitration. Best practice directions are proposed and examples of expert protocol used by the author in his arbitration practice are appended to the article for further reference and to assist in maximising the value of party appointed expert evidence to parties and Tribunals.