What is the major different between Perpetual Inventory count and Stock take and cycle count?

the activity of checking a shop's stock". More specifically inventory control may refer to: In operations management, logistics and supply chainmanagement, the technological system and the programmed software necessary for managinginventory.

The main difference will be 

1. Perpetual will be the most accurate with high cost process 

2. stick take / cycle count are normal inventory with physical count with system data