This work focusses on the development and implementation of a Relationships Framework based on Te Tiriti/Treaty of Waitangi. Within that Framework, an original organisation development tool based on a Tiriti/Treaty two-worldview approach is explored in terms of its potential to facilitate change in the operation and management of public life in Aotearoa New Zealand. Working with worldview difference in the context of Tiriti/Treaty of Waitangi relationships and their implications is critical to the sustainability of organisational change in community and public sector organisations.