Trusteeship is a collective office, and the rules on shared decision-making shape everything from day-to-day administration to liability for a co-trustee's default. This chapter begins with the duties to act unanimously and personally, including the bar on fettering discretion and the position of the passive trustee, before turning to delegation — what trustees can collectively hand to agents, the supervision they still owe, and individual delegation by power of attorney. It then works through the breach of trust claim itself: the elements a claimant must prove, the remedy of restoring loss to the fund, and contribution between trustees in breach. The chapter closes with the defences available to a trustee, including exemption clauses and court relief, the limitation rules, and the court's power to remove a trustee whose conduct puts the trust at risk.