The basic content required by "rules". The level of detail and complexity of the bidding documents will vary with the size and nature of the bidding project and contract. However, each "rule" stipulates that the bidding documents must contain sufficient information to enable bidders to submit bids that meet the needs of the procuring entity and enable the procuring entity to compare in an objective and fair manner. To sum up the provisions of each "rule", the contents of the bidding documents usually fall into three categories: one is the provisions on the preparation and submission of bids, including the notice of bidding, instructions to bidders, forms and signing methods of bids, etc. The other is contract terms and conditions, including general terms and special terms, technical specifications and drawings, lists of goods and quantities, delivery time and completion schedule, and necessary attachments, such as the format of various deposits. The bidding documents must also include the third category of contents, the basis for bid evaluation and selection of better bids, but the words are usually clearly specified in the Instructions to Bidders and the technical specifications.