Original: The growth of the ministry in the 1940s and 1950s made this increasingly impractical , and in 1956 Robert Menzies created a two-tier ministry , with only senior ministers holding Cabinet rank , also known within parliament as the front bench .
Simplified: With more ministers added in the 1940s and 1950s this made the cabinet too big . In 1956 Robert Menzies created a two level ministry , with only senior ministers in the Cabinet .