Need

On set, you suddenly realize: the scene needs a detail that no one planned. A prop, an extra's costume, a lamp in the background — something that makes the shot work. That's a need. Not improvisation in an artistic sense, but a spontaneous additional requirement that arises during ongoing production and must be resolved immediately. Every need costs time and money — often more of both than you could have planned for.

In practice, this happens constantly. The director sees the location for the first time with real light and suddenly wants a specific chair in the background. The actor feels uncomfortable in their costume and needs an alternative. The cinematographer, during the first setup, realizes a reflection in the window is distracting and a certain curtain is needed. The production team then has to react at short notice — either dip into the budget, send out a runner, or improvise creatively with set dressing. Every minute counts: every need costs at least 15–30 minutes of shooting flow, often more.
The trap with needs is the cascading effect. One need leads to three new needs. The missing chair needs a table. The new costume needs shoes. The new curtain needs a bracket because the old one doesn't fit. Experienced line producers and UPMs anticipate this — they always keep a small buffer in the budget and prioritize needs. Is the shot playable without the need? Can it be fixed in the edit? Does it really require a location change, or will a simple workaround suffice?
Professional sets minimize needs through intensive prep and tech scouts. The more thorough the location scouting, the fewer surprises. But needs are part of the filmmaking business — they are not errors in planning, but the nature of live production. The real film is made on set, not on paper. The best strategy: identify needs before the director sees them, and reserve that meager half-hour in the schedule for exactly these moments.