- Country: France, Portugal
- Genres: Drama
- Release: 2002-09-11
- Director: Manoel de Oliveira
- Writers: Agustina Bessa-Luís , Manoel de Oliveira , Jacques Parsi , Júlia Buisel
- Language: Portuguese
- Stars: Leonor Baldaque , Leonor Silveira , Isabel Ruth , Ricardo Trêpa , Ricardo Trêpa , Ivo Canelas , Luís Miguel Cintra , José Manuel Mendes , Carmen Santos , Cecília Guimarães , Júlia Buisel
- Runtime: 133 min
- Awards: 2 nominations
- AKA: 家宝 (Japan) , El principio de la incertidumbre (Spain) , Μοιραία κατάληξη (Greece) , Le principe de l'incertitude (France, French Republic) , Bijou de famille (France, French Republic) , O Princípio da Incerteza , Jóia de Família (Portugal, Portuguese Republic) , The Uncertainty Principle , Reguła niepewności (Poland) , Η αρχή της αβεβαιότητας (Greece) , Il principio dell'incertezza (Italy)
- Plot: Having lost her place among the social elite, a widow remarries and starts a family.
- IMDB:tt0303162
The Uncertainty Principle Cast · · · ALL
Manoel de Oliveira
Director
Leonor Baldaque
Camila
Leonor Silveira
Vanessa
Isabel Ruth
Celsa
Ricardo Trêpa
José Feliciano, 'Touro Azul' / Fiscal
Ivo Canelas
António Clara
Luís Miguel Cintra
Daniel Roper
Júlia Buisel
Tia Tofi
Ângela Marques
Adoração
Diogo Dória
Polícia
João Bénard da Costa
Ferreira
Cecília Guimarães
Rute
Carmen Santos
Joana
António Fonseca
Policeman
Adelaide Teixeira
Mãe
José Manuel Mendes
Torcato Roper