Each autumn, China's Communist Party gathers more than 350 of its top bosses to an army-run hotel in Beijing to discuss, behind closed doors, the issues facing the state. This year's plenum coincides with the unveiling of a new five-year plan for the nation, President Xi Jinping's first such blueprint.
This plan - a Soviet-inspired cornerstone of the centrally planned economy - will be sweeping and inclusive, touching almost every corner of nation-building, from the economy to foreign policy, the military and the environment. It's the framework for Xi to fulfil his promise three years ago that by 2020 China would become a "moderately well-off society" - meaning GDP and income per capita would double from 2010 levels.
The delegates to the four-day plenum don't make the plan - that was masterminded by Xi's financial team and drafted by the National Development and Reform Commission. Nor do they formally endorse it - that's done in the spring by the National People's Congress, China's parliament. What they do is fill in some details, occasionally amend areas of the plan, and figure out how they will implement it in their provinces and cities.
Here are five highlights we can expect from this year's gathering: