How is open learning different from other types of alternative education models like Montessori, Waldorf, Krishnamurthi, etc ?

Broadly, education models like Waldorf or Montessori, etc. follow a different process and approach towards learning, though they still follow the curriculum / subjects (at least for ages over 9 years) outlined by various educational boards. Also usually, alternate schools group children by age / class.

In open learning obviously there is no given curriculum or grouping or structure. Each child/family designs and plans their own structure / journey.

(Please note: the above is a general comparison and would differ from school to school).

Detailed Article: Open Learning compared to other education systems