Any explicit documents or facts for relation between Scrum and Agile ?

From a Scrum perspective, if it isn"t found in the Scrum Guide then it's a matter of interpretation. Freedom to interpret is necessary since context must be taken into account.

If you need one, maybe the fact that Ken Schwaber wrote two books about Scrum: "Agile Software Development with Scrum", and "Agile Project Management with Scrum" will be enough to support the connection that you seek?

Exactly what are you looking for?

Here are some facts:

• The roots of Scrum are in the 1968 paper "The New New Product Development Game" by Hirotaka Takeuchi and Ikujiro Nonaka, published in the Harvard Business Review. Some of the characteristics presented in this paper are related to Lean and come from Lean Manufacturing and Toyota Production System, but applied to product development.
• The first Scrum team was created in 1993 at Easel Corporation. Jeff Sutherland held the role of Chief Engineer for one of the products at this company and was instrumental in defining and creating the first instances of Scrum roles and artifacts.
• In 1995, Jeff introduced his Scrum Team to Ken Schwaber. Ken and Jeff worked together to formalize Scrum. It would be presented at OOPSLA 95.
• In 1995-1996, Jeff provided some information about the successes with Scrum to Kent Beck, as Kent was defining Extreme Programming. Since this exchange, there has been a relationship between the practices of Extreme Programming and Scrum in software development.
• The Manifesto for Agile Software Development was written in 2001. Both Jeff and Ken were there since their work with Scrum was widely known to the other authors, having shared their successes at different conferences. Kent Beck and some of the people he worked with on Extreme Programming were also there. Other methodologies and their creators or proponents also worked on the Manifesto.
• Scrum in software predates Agile Software Development by about 8 years.
• The Scrum Guide is regularly revised based on feedback from people practicing Scrum. It captures the current "rules of the game", and has evolved quite significantly from the first published version of the guide, and even more so than the practices used by Jeff at Easel Corporation.

Thanks Ian Mitchell, Piotr Górajek and Thomas Owens for the feedback and the facts.  By interpreting, we can see that Scrum has some characteristics of Agile (mapped to Agile Manifesto, Agile Principles). The people say Scrum is a kind of Agile, but Scrum is more about empirical approach (a type of research approach). Scrum Guide: "Scrum is founded on empirical process control theory, or empiricism" and it was born before Agile Manifesto.

Is there any things from Scrum  Founders or Agile Manifesto Founders saying that Scrum is a kind of Agile or Scrum is a kind Agile Practices? or any events in the past proved that true ?



The reason i am finding it is: Some people says Scrum is a kind of Agile, so when they are failing with Scrum, they think about Kanban is an alternative kind of Agile for working.



Thanks

Vinh

Broadly speaking, Agile can be seen as mindset. Many companies are starting to roll out business agility in non-IT business units because they see the value in empiricism. So if a team is failing to adopt Scrum, Kaizen, Kanban, etc. don't analyze the framework. Analyze the team.