The Colby Act establishes supported decision-making agreements as an alternative to guardianship or conservatorship. These agreements allow adults to receive support and accommodations in the decision-making process without impeding their self-determination. The bill outlines the conditions for entering into a supported decision-making agreement, including that it must be voluntary and without coercion or undue influence. It also prohibits third parties from requiring an adult to execute such an agreement. The bill provides a template for creating a supported decision-making agreement, which includes sections for designating supporters for various decision-making areas. Supporters are required to act in the best interest of the adult and avoid conflicts of interest. The bill also allows for the appointment of more than one supporter and an alternate supporter, and provides legal protections for those who rely on the authorization in a supported decision-making agreement in good faith.