The 7 SPs in group C follow a very complementary approach, as they all concentrate on different levels of analysis, starting from the micro-farm and household level up to the macro-national and international level, as shown in the figure below. Moreover, they follow complementarities in terms of their methodological approaches; both quantitative and qualitative tools will be developed, applied and adapted to the specific Indonesian context. While some of the SPs will use structured surveys and econometric techniques (C01 Brümmer, C04 Klasen/Lay, C07 Qaim, C08 Wollni), others will use economic field experiments (C06 Mußhoff, C08 Wollni), village and household case studies and participatory approaches (C02 Faust, C03 Hauser-Schäublin), as well as stakeholder interviews (C02 Faust).
A joint sampling framework has been developed for the different data collection activities, as shown in the figure below. As mentioned above, this sampling framework covers the households that own the core sites of project groups A and B and the corresponding villages where these households reside. Being able to merge different data sets at the village, household or plot level will lead to important synergies, some of which are described in the individual SP proposals.