loyalty is sufficient evidence of client satisfaction and of positive impact, and that further measurement is unnecessary. This article argues against this: impact assessment is necessary not only to demonstrate
to donors that their interventions are having a positive impact, but also to provide information that allows MFIs to improve their services, and thus improve impact. The article describes the move away
from donor-led impact events, towards more practitioner-focused processes, and outlines the experience of individual organizations and international projects, most notably the AIMS project, in developing
impact assessment that is more responsive to practitioner needs. Practitioner-focused impact assessment looks at how impact information can feed into management and product design processes, and provide
frequent and timely information. Many challenges remain, particularly in terms of ensuring a diversity of approaches and applications for IA, and the inclusion of a range of stakeholders in defining what
should be included in the impact assessment process, and in the analysis and use of results. These challenges are the focus of a Ford Foundation sponsored action-research programme, Imp-Act.