A draft plan to boost Japanese growth promises to overhaul corporate governance, promote technology and attract private investment, but it leaves many of the toughest questions unanswered as the country seeks to claw its way out of a crippling cycle of deflation.

The 60-page draft outline of Prime Minister Shinzo Abe's growth strategy has not been made public, but it has been reviewed by journalists.

It gives no details of how and whether the government would cut the corporate tax rate.