The data validation run valid for the population number (jumlah_penduduk), household waste disposal
(pembuangan_sampah), and transporting household waste (pengangkutan_sampah). The functional intervention is
based on the statistical analysis for each sub-variables. The Absolute Means Error (AME) for those variables are
below 30%, so all variables are valid. The SFD with the intervention can be seen in Fig. 4.