Flex functionality as opposed to budget, resource (manpower) or time.
I.e. offer a reduced function set in order to meet a release deadline. Better to release little and often than big and infrequently as small, frequent releases allow you to react much better to user feedback.
Prioritise user stories with greater risks and unknowns over those that are within the scrum team's comfort zone.
Realise that complex systems emerge chaotically and priorities and audience with always be in flux as time goes on. Less
individuals and interactions over processes and tools;
working software over comprehensive documentation;
customer collaboration over contract negotiation; and
responding to change over following a plan. Less