  There is growing evidence that digital peer-support networks can have a
positive influence on behaviour change and wellbeing outcomes for people who
harm themselves and others. However, making and sustaining such networks are
subject to ethical and pragmatic challenges, particularly for perpetrators of
domestic violence whom pose unique risks when brought together. In this work we
report on a ten-month study where we worked with six support workers and
eighteen perpetrators in the design and deployment of Fragments of the Past; a
socio-material system that connects audio messages with tangible artefacts. We
share how crafting digitally-augmented artefacts - 'fragments' - of experiences
of desisting from violence can translate messages for motivation and rapport
between peers, without subjecting the process to risks inherent with direct
inter-personal communication. These insights provide the basis for practical
considerations for future network design with challenging populations.
