Usually I include a detailed list of costs, originally formulated in Excel.
It breaks down each task and includes consultation time, time and hours for each task.
For writing, editing and translation, the times are based on industry standards and on my own estimate of what the project will require.
It also includes any relevant assumptions for those tasks (e.g., for editing: Assumes one pass for copy-editing and all final material will be received before that task is done.)
