According to a survey carried out in the USA by the research group, Marketing Experiments, over 56% of all shopping carts are abandoned before a visitor completes the checkout process.

So how do you manage or “nurture” the people who abandoned your cart?
The survey revealed that an optimised email campaign, aimed solely at re-engaging visitors who abandoned your cart (the abandonee), can more than double the ecommerce conversions.
Firstly, conversion rates are known to suffer when people are faced with an over complex check-out process. It becomes too much like hard work, or they go off and do something else before completion.
More often than not, the greater the number of questions deemed unnecessary by visitors using your check out, the lower your conversion rate will be.
Certain information, like billing, shipping and payment are essential and recognised as such by visitors. Smart ecommerce retailers split up the process and insert a series of guarantees and inducements to help guide people to the buy button.
Their first page might just be about registering, requesting just the name, email address and password before getting into the guts of the checkout process. These few details are all you need to email and reconnect with people who abandon the process later on.
When you look at the steps taken by the real exponents of ecommerce retailing, like Play.com or Amazon.com, you’ll understand why they set out their pages in the way they do.
Secondly, the re-connecting email should be sent no later than 24 hours after they’ve disengaged. The longer you wait, the more they will justify their decision not to buy.
People will often abandon a cart not because of the price. A follow up email can be written to suggest perhaps a “technical error” prevented them from completing their order - without putting any “blame” on the abandonee.
Checkout processes that display a tracking bar are very useful for reminding users exactly where they are in the process.
The first email should be followed by a second one, after another 24 hours, to include some additional incentive to encourage them to return.
Thirdly, if they still fail to return, try sending an email with a precise offer plus more information about the product they were selecting before they abandoned your process.
While it is impossible to redress all the reasons why someone abandons the process - lack of trust, uncertainty over price, confusion over product features, etc - an automated email campaign can address some of the reasons.
Marketing Experiments showed that adding an incentive to complete a purchase can increase ecommerce conversion rates by over 260%.
Source: Sam Mallikarjunan, ecommerce abandoned cart nurturing, HubSpot. 3 August 2011