In filmmaking and video production, pre-production formally begins once a project has been greenlit. At this stage, finalising preparations for production go into effect. Financing will generally be confirmed and many of the key elements such as primary cast members, director and cinematogropher are set. By the end of pre-production, the screenplay is hopefully finalised and satisfactory to all the financiers and other stakeholders.
Some of the things that occur during the pre-production process consist of, the script being broken down into individual scenes storyboards and all the locations, props, cast members, costumes, special effects and visual effects are identified. An extremely detailed schedule is produced and arrangements are made for the necessary elements to be available to the film-makers at the appropriate times.
Sets are also constructed, the crew will be hired, financial arrangements are put into place and a start date for the beginning of photography is set. At some point in pre-production there will be a read through of the script which is usually attended by all cast members with speaking parts, the director, all heads of departments, financiers, producers, and publicists.
In a nutshell, pre-production is the process that takes place just before production begins. The process involves the preparation of all of the elements involved within the chosen media type (film, play, or other performance).
Pre-production is one of the 3 parts of the production phase. It occurs first, before production and then post-production occurs after this.