Yokoten can be described as a process for best practice sharing which is also commonly known as "horizontal deployment" or "sideways development". The etymology of the word describes it all: Yoko means sideways or horizontal and tenkai means development.
Any Kaizens that are successful are improved and replicated throughout the organization. It works sideways as it means that employees should go see for themselves what Kaizens work in other areas and bring them back for implementation in their own areas. Since the Kaizen will need to be modified for application in other areas, it also solves the purpose of additional learning throughout the organization, making organizations really drive the culture of learning.
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by R Rajesh on 25th November 2018.
Also review the answer provided by Mr Venugopal R, Benchmark Six Sigma's in-house expert