Conervative Party leader David Cameron is to set out his blueprint for modernising the the party with an official "statement of values".
He will ask members of the party to endorse values that include putting economic stability ahead of tax cuts and ensuring the party's make-up reflects modern Britain.
The final version will be put to a ballot of the party's entire 250,000-plus membership, with the result known in time for the annual conference in October.
Mr Cameron has already been criticised for failing to back his claims to be leading the Tories in a new direction with firm commitments.
In a key speech in London, Mr Cameron will say: "This party voted for change. Now we have to show what change means. Not just what we're changing from but what we're changing to.
"If we don't change, we let our people down. If we make the changes, if we stick to them, if we show that they're built to last, then we will be able to meet the challenges this country faces and help create a better Britain - built to last."
Mr Cameron played down comparisons between the "statement of values" and Tony Blair's iconic move to persuade Labour to ditch "Clause Four" - its commitment to nationalisation.
The Tory blueprint declares that the party's aim is to "improve the quality of life for everyone" through a dynamic economy, a strong society and a sustainable environment.
The test of Tory policies must be "how they help the most disadvantaged in society, not the rich", it insists, reversing Margaret Thatcher's famous phrase to declare "there is such a thing as society".
PA