score = (x) -> 
  if x == "Yes"
    10
  else
    0

weights = [0.5, 0.125, 0.125, 0.25]
dependencies_on_nature = [dependencies_on_nature, dependencies_on_upstream_value_chain, dependencies_on_downstream_value_chain, dependencies_on_nature_quantification]

weights.reduce((weighted_sum, weight, index) -> 
              weighted_sum + weight*score(dependencies_on_nature[index])
             , 0)