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

weights = [0.2, 0.2, 0.2, 0.2, 0.2]
key_species = [key_species_disclosure, key_species_upstream_relationship, key_species_status, key_species_status_upstream_relationship, key_species_conservation_strategy]

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