This learning brief highlights how collaboration amongst Caritas Internationalis member organizations led to the enhanced effectiveness and efficiency of institutional strengthening of the Karuna Mission Social Solidarity (KMSS) in Myanmar.  It reflects on the experience of KMSS leadership, Caritas Australia, CAFOD, CRS and Trócaire with KMSS’ institutional strengthening. Each Caritas member organization provided, in a coordinated manner, the institutional strengthening and capacity building support per KMSS’ identified and prioritized capacity needs. Member organizations’ support also included instances of joint funding of KMSS’ institutional strengthening.