  We make the case for the systematic, reliable preservation of event-wise
data, derived data products, and executable analysis code. This preservation
enables the analyses' long-term future reuse, in order to maximise the
scientific impact of publicly funded particle-physics experiments. We cover the
needs of both the experimental and theoretical particle physics communities,
and outline the goals and benefits that are uniquely enabled by analysis
recasting and reinterpretation. We also discuss technical challenges and
infrastructure needs, as well as sociological challenges and changes, and give
summary recommendations to the particle-physics community.
