Ensuring high consistency and accuracy in data annotation involves establishing clear and objective labeling guidelines. Your instructions should be detailed, with examples and illustrations to clarify expectations. Consistency is achieved by setting standard criteria for annotating various data types, ensuring all annotations follow the same rules. To reduce personal biases, train annotators to stay neutral and objective. Regular reviews and updates of labeling rules help maintain accuracy and alignment with project goals. Using automated tools to check for consistency and getting feedback from other annotators also contribute to maintaining high-quality annotations.