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

• time immemorial
• time interval
• time lag
• time limit
• time loan
• time machine
• time note
• time of arrival
• time of day
• time of departure
• time of life
• time of origin
• time of year
• time off
• time out of mind
• time period
• time plan
• time scale
• time series
• time sharing
• time sheet
• time signal
• time signature
• time slot
• time study