Importance Of A Shot List

I found the below on the Vimeo website.

"A shot list is a full log of all the shots you want to include in your film; essentially it is a checklist filled with minute details that will give your film a sense of direction and efficiency.
Shot lists help you consider shooting footage based on location and setup; not necessarily in the order of the story. Say your shoot starts at a supermarket, moves to a bank, and ends at the supermarket. With a shot list ready you can more quickly shoot all the scenes at the supermarket first, and then shoot the rest at the bank later on in the day. Simple enough, right?
Below is part of the script from the latest original short Vimeo Man.

It is annotated with shot terminology, a shot list allows you to clearly organize and display these terms. Here is a snippet from our completed shot list.

As you can see, our shot list template includes columns for the scene number, shot number, location, shot description, framing, action/dialogue, actors involved, props needed, and extra notes.

• Scene Number + Shot Number help to break down a scene into a certain number of shots. For each scene we use a number and each shot we use a letter.
• Shot Description should include a subject and an action, for example "Matt bites an apple".
• Framing describes the vantage point from which you choose to shoot and the aspect of your subject you wish to capture. Check out an array of different shot types here.
• Action helps to express camera movement, for example 'Camera dollies towards Vimeo Man' or 'Pan to Sam'.
• Dialogue gives a snippet of the characters conversation within the shot."

In summery, the document says that a shot list consists of all the shots, and can be like a 'check list' of the shots which are required, and consists of every minute detail, which will help with both 'direction, and efficiency' during our shoot. The shot list is also not in the order of the video, but is instead in the order of the shots, the above document put it nicely, that if you are wanting to have a video where the guy walks into a super market, and then in to a bank and back into the super market, the shot list would have the supermarket shots first, and then have the bank shots, this method saves time and money in both transport, and also in the amount of time that you had to pay for your actor. 
 A shot list is essential, because when filming you have limited time available, with actors, props hired, and access requirements. It will also be very useful to have a time schedule, so that the actors only need to be at the location for a limited time.