diff --git a/.gitignore b/.gitignore
index f590948..f13477d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 koans/.path_progress
 *.sqlite3
 .rbenv-version
+*.rbc
diff --git a/cookbook/016/03.rb b/cookbook/016/03.rb
new file mode 100644
index 0000000..456529f
--- /dev/null
+++ b/cookbook/016/03.rb
@@ -0,0 +1,12 @@
+require 'xmlrpc/client'
+
+server = XMLRPC::Client.new2('http://betty.userland.com/RPC2')
+puts server.call('examples.getStateName', 5)
+
+
+begin
+  server.call('noSuchMethod')
+rescue XMLRPC::FaultException => e
+  puts "Error: fault code #{e.faultCode}"
+  puts e.faultString
+end
diff --git a/cookbook/016/03b.rb b/cookbook/016/03b.rb
new file mode 100644
index 0000000..09a9ffd
--- /dev/null
+++ b/cookbook/016/03b.rb
@@ -0,0 +1,25 @@
+require 'xmlrpc/client'
+
+
+def lookup_upc(upc, rpc_key)
+  server = XMLRPC::Client.new2('http://www.upcdatabase.com/xmlrpc')
+  begin
+    response = server.call('lookup', :upc => upc, :rpc_key => rpc_key)
+    return response['found'] ? response : nil
+  rescue XMLRPC::FaultException => e
+    puts "Error: "
+    puts e.faultCode
+    puts e.faultString
+  end
+end
+
+
+['018787765654', 'no such UPC'].each do |upc|
+  product = lookup_upc(upc, ARGV.first.strip)
+  if product
+    puts product['description']
+    puts product['size']
+  else
+    puts "Oh no! product with upc='#{upc}' is #{product.inspect}"
+  end
+end