North has a choice, bid 2♣ (strong - EBU rule that it must have either 16+HCPs or 13+HCPs with 10+ cards in 2 suits and Game Forcing is just met) but with two suits a slam in ♣ s may be an option.

Whilst 1♠  it might allow partner to help with ♣ s, however the oppostion might come in.

Strong 2♣ 

East will pass

South will bid 2♦  (negative)

West will overcall 2♥ 

North will bid 2♠ 

East has the choice between 3♥ (a bit weak) and 4♥ (a bit strong)

South will pass 

West will raise 3♥ to 4♥ 

North will bid 4♠ 

East has probably already shown his hand so will pass

South will pass

West then has the choice to pass or will probably bid 5♥ .

North has little in defence so will probably bid 5♠ . This should be -1 but only if East leads a ♥ or ♠ 

In fact 5♥ should go off -3, but only if the defence find the ♣ and ♦ cross ruff.

Opening 1♠ 

East will pass

South may bid a pre-emptive 3♦ 

Over a pass West will double - with the aim of rebidding ♥ s to show a strong hand. Over 3♦ West will bid 3♥ .

North will then bid 4♠ 

Over a south 3♦ route East may bid 5♥ , but over a double he may pass.

West may bid 5♥ if East passes.

The same dilema and bids as per the strong route.