Strategy time: What could be a winning approach for each leader?

The countdown is on with less than a week until Canadians head to the polls on Oct. 19. For most of the campaign the longest in modern Canadian history the main parties have been in a three-way race for the lead.

• Terry Milewski: With a week left, there's still time for more nonsense
• Election campaign's final week sees party leaders digging in
• Trudeaumakes pitch to Tory voters in Ontario
• Leaders know they must win Ontario to secure power
• Harper's attack on Liberal tax plan draws Price is Right comparisons online

But in the last few weeks, Justin Trudeau and the Liberal Party have grown their levels of supportand taken the lead, according to CBC's Poll Tracker.But a week is a long time in politicsand virtually anything can happen.

CBC News has consulted the experts: What is the best strategy forthe different party leaders as they seekto come out on top in this election campaign? What are the areas of weakness?

And what can theConservatives and NDP to do to turn things around at this late stage?You can find the answers to some of those questions in the storiesbelow:

1. Conservatives:Focus on Quebec, Greater Toronto Area

2. Liberals:Tout themselves as the party to replace Harper

3. NDP: Hit hard on TPP and reframe niqab debate