A surprisingly high number of companies work on bid documents then decide not to submit them. A bid / no-bid decision made at an earlier stage could save you time and energy.
Tender material should be recycled whenever possible because this is an efficient use of your resources. To reuse it successfully, however, you must check the relevance of the material to the new tender, and ensure it is tailored to the requirements of the new customer.
Pictures, diagrams and tables are a great way to add interest to your proposals. They make your document easier to read and can highlight important points that might otherwise be buried in the text.
Before you start writing, think about your reader and the response you want to generate. This response should lead them to think or do something that will give you the result you want.
Good punctuation is vital. Poor punctuation creates an impression of lazy, slipshod and badly educated staff.