This article explores a range of ethical issues that arise in community-based participatory research (CBPR), drawing on literature and examples from practice. The experience of CBPR practitioners adds further weight to the growing critique by many other social researchers of regulatory approaches to research ethics (which focus on rule following in accordance with research governance frameworks, codes of conduct and ethics review procedures). Yet, whilst many of the ethical challenges in CBPR are common to social research generally (informed consent, anonymity, issues of ownership of data and findings), the dynamic, complex and value-based nature of CBPR gives them particular prominence. There are also specific issues relating to the ethics of partnership working, collaboration, blurring of boundaries between researchers and researched, community rights, community conflict and democratic participation that are more frequently encountered in CBPR. Four practice examples are used to demonstrate this argument. These are taken from a young women's community allotment, a community organisation researching poverty, a youth peer research project and a museumbased digital storytelling project. The article concludes that current institutional ethical codes, guidelines and ethical review procedures are not particularly well-suited to CBPR, in that they adopt principle-based and regulatory approaches to ethics; whereas character-and relationshipbased approaches to ethics are also very important in CBPR, which is adopted by many researchers with a strong value commitment to social justice.

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This paper argues that trust cannot be taken for granted in long-term participatory research and promotes greater consideration to conceptualizing the trusting process as fluid and fragile. This awareness by researchers can reveal to them how the passing of time shapes and reshapes the nature of trusting relationships and their constant negotiation and re-negotiation. The paper draws together literature from different disciplines on the themes of trust, temporality and participatory research and outcomes from interviews and workshops undertaken for The Trust Map project to focus on two key moments that reveal the fragility of trust. These are the subtlety of disruption and trust on trial and trust at a distance. We discuss how trust was built over time through processes of interaction that were continually tested, incremental and participatory.

Trust is an essential if often implicit aspect of co-design particularly when working in community-based, political and sensitive settings. Current co-design literature, however, remains fairly limited focusing on interactions between people as primary agents of trust. Drawing on research conducted with a poverty alleviation charity based in the UK, we illustrate how trust and distrust can also be mediated through material resources used in the codesign process. The paper highlights the significance of materials in negotiating the interdependencies of trust, in how distrust can be leveraged and trust can be supported through sensitive sociomaterial exchange conducted with resource limited community organisations.

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