We all know that the work doesn't end after the shooting does, in fact we can often spend more time behind the computer editing than behind the camera creating magic. But, before editing can happen, we have to decide which photos to keep and which ones aren't worth our time. The quicker we create a system to cull our images, the more we can focus on what really matters. 
1. Don't Delay
The more you put off culling images, the more it will pile up and seem like a chore. It is also easier to go through images when they are fresh in your mind and are still excited to see what you've got.
2. Remove Duplicates
The first step is to quickly go through all of your images and remove the duplicates - this shouldn't be difficult and it's important not to over think this step. Stick with your first initial instinct and don't look back.
3. Use a Grid System
Instead of viewing photos one at a time you may find it easier to view them in a grid so that it is easier to compare them and more apparent on which is the best image.
4. Put Aside Your Emotions
Stepping back from the emotional aspect of your images and seeing them more from a photographer's perspective will help you make the tougher decisions. Try not to get too attached to your images and don't be afraid to be ruthless. It sounds harsh, but at the end of the day decisions need to be made or you will end up with a mountain of images.
5. Focus on the Technical Aspects
The easiest way to put aside your emotions is to concentrate on technical aspects such as focus, lighting, framing etc. There is no use in keeping a photo that is technically wrong, as this will distract from the beauty of the image anyhow.
6. Find a Flagging System
Whether you choose to "star" your images, flag them using colours or "x" them in Lightroom, find a system that makes the most sense for you and stick with it.
7. How Will Your Images Be Used?
It's important you think about how your images are going to be used. For example, if you plan on making a massive print, it's important you really pay attention to the sharpness of your images and so on.
All in all, culling your images doesn't have to be a difficult task. By trying to work quickly, putting aside your emotions and developing a flagging system that works for you, you'll soon be back behind the camera shooting away.
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