COBie has required field statuses for most tables and some fields are prerequisite to using subsequent tables. The reference and if-specified field statuses are prescriptive once the required fields are completed for each table. A list of required, reference, and if-specified field statuses are in the Structure section. When selecting tables and fields to use for a project, specify how much information is necessary for each type of equipment, because it may not be useful to collect COBie data for all equipment in the built environment. For example, it may not be useful to spend the effort collecting the serial number for every light fixture if the policy is to replace it with a similar type when it is unrepairable. However, it may be necessary to collect the serial number for equipment with long warranty durations to assist with filing a possible future claim.