These books can show you the way from stuffy, third person, passive writing to first person, clear, active writing. Check the GPO Style Manual too. These guides establish rules and standards for writing effective instructions. They are covered in the four divisions below. People emphasizes the importance of knowing who will use an instruction and writing it to them.
Structure emphasizes the benefits of using a clear and logical sequence outline.
Words suggests techniques for efficient writing and emphasizes the choice of simple, clear, direct language. Remember that your instructions will be read and used by people. Think about the people and the conditions under which they might be using this instructions. The user will also appreciate background information which will help to understand the instruction better. Before you begin to write, know clearly your own objectives.