13. A non-transitory computer-readable storage medium storing one or more instructions which, when executed by one or more processors, causes the one or more processors to perform steps comprising: causing displaying a first user interface at a first computer; receiving at a production manager computer, from the first computer via the first user interface, scene metadata defining a plurality of scenes of a media production; causing displaying a second user interface at a second computer that is different from the first computer; receiving at the production manager computer, via the second user interface, at a time after the scene metadata was received and before closing the media production, item metadata for a particular item appearing in the media production, wherein the item metadata specifies a scene, from among the plurality of scenes, in which the particular item appears; using the production manager computer: based on the scene metadata and the item metadata, creating a record in an item database that associates the particular item with the specified scene; determining one or more time values representing a time period during which the particular item appears in the media production based on the scene metadata; generating data specifying when the particular item and each of a plurality of other items appears in the media production based on the time period, wherein the data includes the one or more time values.
13. A non-transitory computer-readable storage medium storing one or more instructions which, when executed by one or more processors, causes the one or more processors to perform steps comprising: causing displaying a first user interface at a first computer; receiving at a production manager computer, from the first computer via the first user interface, scene metadata defining a plurality of scenes of a media production; causing displaying a second user interface at a second computer that is different from the first computer; receiving at the production manager computer, via the second user interface, at a time after the scene metadata was received and before closing the media production, item metadata for a particular item appearing in the media production, wherein the item metadata specifies a scene, from among the plurality of scenes, in which the particular item appears; using the production manager computer: based on the scene metadata and the item metadata, creating a record in an item database that associates the particular item with the specified scene; determining one or more time values representing a time period during which the particular item appears in the media production based on the scene metadata; generating data specifying when the particular item and each of a plurality of other items appears in the media production based on the time period, wherein the data includes the one or more time values. 14. The non-transitory computer-readable storage medium of claim 13 , wherein the steps further comprise: receiving at the production manager computer, via a third user interface at a third computer, at a time before closing the media production, second item metadata for a second particular item appearing in the media production, wherein the second item metadata specifies a second scene, from among the plurality of scenes, in which the second particular item appears, wherein the third computer is different from the first computer and the second computer; using the production manager computer, creating a second record in the item database that associates the second particular item with the specified second scene; using the production manager computer, determining a second time period when the particular item appears in the media production based on the scene metadata and the record in the item database, wherein generating the data is based on the second time period and wherein the second particular item is in the plurality of items.