Of the five major factors at play, three are negative and two are positive.
The outlook for Europe and therefore for world growth is a negative. The bank is assuming Europe will "muddle through" but is naturally watching developments intently.
Another drag on growth is falling export commodity prices, and therefore falling farm incomes.
And the Government's fiscal policy will also subtract from growth in the years ahead.
Where the Budget forecast a return to surplus by 2015, the central bank still sees deficit of more than $2 billion by then.
The two positives are the rebuilding of Chrstchurch and a pick-up in the housing market.
But a revival of the housing market is one of those good things you can have too much of.
While the chances of another housing boom look remote at this stage, the longer mortgage rates remain at what are historically very low levels the greater the risk of one becomes.
In the meantime the lower dollar and lower mortgage rates have made monetary conditions more stimulatory without the Reserve Bank having to do anything.
And that has allowed the bank to conserve its ability to slash the OCR in case the economy suffers another major trauma like the global financial crisis or earthquake.