The following link is useful if you plan on trying your hand at writing a haiku. Actually, it is called the "Haiku Checklist." It is a list that includes some helpful reminders of the key components of haiku writing. It is a great aid if you are new to haiku writing or are a veteran. I found this link by way of The Haiku Society of America. The group plays an active role in educating the haiku writing communitiy. In fact, it organizes and sponsors events for National Haiku Writing Month, including a daily word prompt on Facebook and Twitter.
Click here for the link to the "Haiku Checklist".