Prime Minister Yoshihiko Noda will vow at the Monday start of the Diet session to take measures to avoid sending the languishing economy into a full-on free fall, according to his aides.

As the government has downgraded its basic assessment of the economy for three months straight, Noda may promise in a speech to the legislature to front-load certain measures proposed under a strategy compiled in July to accelerate growth in sectors such as the environment and agriculture, the sources said.

Last week, Noda instructed his Cabinet to cobble together fresh stimulus measures by the end of next month to jump-start Japan's export-reliant economy.