A formwork and method for casting a concrete structure comprising: a first form element for delimiting a cavity to receive concrete, the first form element having an upper end and a lower end, a first tilt sensor for measuring an actual tilt of the first form element,
the first tilt sensor further comprising a first sensor element for measuring the inclination of a lower region of the first longitudinal element and a second sensor element for measuring the inclination of an upper region of the first longitudinal element, and determining a deviation between the inclination of the lower region of the first longitudinal element and the upper region of the first longitudinal element.