Writers know that ideas can come out of the blue. It does not matter where you are; an idea can 'pop' into your head and be gone in a flash if you do not capture it. You may consider carrying a pen and notebook with you at all times to write down your ideas. Some writers may believe that carrying a notebook and pen is 'too old fashioned' or too old school; they prefer electronic gadgets. Make sure you check the batteries in your recorder because it would be terrible not to be able to record your thoughts. A notebook is a tried and true writer's tool!
Reasons to always carry a notebook
To capture your ideas . There's nothing worse than having great ideas only to watch them fade away. Carrying a notebook allows you to capture your ideas wherever, whenever. You will not have to struggle to remember your ideas ever again.
To write down your thoughts . Have you ever had insightful thoughts but did not have any way to record them? A notebook allows you to write down your thoughts which could have been used to create a work of fiction or non-fiction.
To sketch . Some writers are also skilled at drawing. Remember, "A picture is worth a 1000 words." It may help to 'sketch' your ideas rather than write them down.
To outline a novel . If you have an idea, you never know when inspiration will strike. Perhaps an idea comes to you quickly that you're able to 'outline' the story. If you have a notebook, you can easily write down the plot and synopsis.
To outline a screenplay . Perhaps you have an idea for a screenplay. You never know when a 'plot' will come to you. Also, you never know how the people you interact with will inspire you to develop character visits. If the real people in your life are colorful, draw from them and base your characters on them. Observe their mannerisms and personalities. Writing down these and other observations can help you develop rich characters.
You can use it to journal . Maybe you're having a 'bumpy' day. Write down your thoughts and get your emotions out of your system. They say journaling is a good way to clear your mind and soul.
You may need to give someone your contact information . If for some reason you leave your business cards at home, you can tear a piece of paper out of the notebook and write down your contact information. It's not as glamorous as a business card but at least you'll be able to pass along your information.