diff --git a/most_common_nil_fields.rb b/most_common_nil_fields.rb
new file mode 100644
index 000000000..53be3cc92
--- /dev/null
+++ b/most_common_nil_fields.rb
@@ -0,0 +1,17 @@
+blank_attribute_frequencies = Hash.new(0)
+
+items = LettingsLog.where(status: "in_progress").where("owning_organisation_id >= ?", 4466)
+i = 0
+items.each do |item|
+  LettingsLog.attribute_names.each do |attribute_name|
+    blank_attribute_frequencies[attribute_name] += 1 if item.send(attribute_name).blank?
+  end
+  pp i
+  i += 1
+end
+
+most_common_blank_attributes = blank_attribute_frequencies.sort_by { |_, count| -count }
+
+most_common_blank_attributes.each do |attribute_name, count|
+  puts "#{attribute_name}: #{count}"
+end