QCon Tokyo was held at Tokyo conference center, Japan on April 9-10, 2009.

I have attended several sessions and found some common trend. That is, "Simple is best".

In Martin Fowler's keynote speech, he presented Domain Specific Language (DSL). He highlighted readability of code, as role of DSL. It helps business people to understand an application.

Also, Rod Johnson, the creator of Spring, in "Spring in a Changing World" stated the failure of old J2EE at first. According to Johnson, J2EE failed because of its complexity. Now developers want simple solutions. and He concluded that "enterprise Java must get simpler".

Junzo Hagimoto, a Requirement Development Methodologist, described about how to bring business values into system development. There are misunderstanding and conflict between customers and developers. He recommended to show the whole picture to both and have strategy for generating business value. He said that he was seeking to think and do everything simply.

Yukihiro Matsumoto, the creator of Ruby, also introduced Paul Graham's word, "succinctness is power", in his keynote speech "Beautiful Code". He states that code is beautiful and simplicity is also beautiful.

As a developer, I believe that seeking simplicity will improve the quality of code and the working environment of developers. Since new technologies are constantly generated and the world becomes increasingly complex, the simplicity will be one of the key factors for success.