The Government will tomorrow announce €27bn in funding for spending on capital projects from 2016 to 2021.
Key areas include transport, education, health, housing and flood protection.
A mid-term review of the plan will take place in 2017 and new rules for public-private partnerships will also be announced.
A rail link from Dublin city centre to Dublin Airport and onto Swords will be the centrepiece of the transport plan.
There has been increasing speculation about a revised metro plan and that is now a very strong option.
Passenger capacity, the number of stations and the overground elements will be of interest.
The transport plan, which also includes a roads investment plan, will run over a seven-year period.
€3bn is going to be spent on education.
This will be allocated to school building or extensions, third-level investment and information technology initiatives.
The particular schools that will form part of the school building programme will not be named tomorrow. They are expected to be outlined in a few weeks.
To deal with rising enrollments, funding is going to be provided for an additional 19,000 primary school places by 2018 and for more than 40,000 secondary school places by 2022.
There will also be a pledge to eliminate the use of prefabs.
With health, it was revealed recently that €450m will be invested in refurbishing or replacing State-run nursing homes.
There will also be new primary care centres - the locations will not be announced tomorrow.
€1bn will be spent on flood prevention over ten years.
300 areas have been identified as at risk by the OPW and funding will be provided for 200-250 projects.
The State currently funds six major flooding relief projects a year.
Under the plan this will rise to 24 a year at its peak.
The social housing plan will be extended by a year and an additional €500-600 million is going to be provided.
€3.8bn funding was announced previously by the Government up to 2020.
A further €200m was pledged by the European Investment Bank.
A refurbishment programme for regional garda stations will also be funded.
Overall specific projects in terms of schools, primary care centres or flood relief schemes will not be named tomorrow and close attention will be paid to what projects have won out as well as the ones that have been dropped.