1. In a gradual manner
   - gradually, bit by bit 
2. Proceeding in steps
   - stepwise

1. One thing at a time
   - bit-by-bit, in small stages, piecemeal, stepwise

See also: gradual

Encyclopedia: Step by step

• testee
• tester
• testicle
• testicular
• testicular artery
• testicular cancer
• testicular vein
• testiere
• testifier
• testify
• testily
• testimonial
• testimonial immunity
• testimony
• testiness
• testing
• testing ground
• testing room
• testis
• testosterone
• Testudinata
• Testudines
• Testudinidae
• testudo
• Testudo graeca