German term (edited): Willensfertigkeiten

... I would think - all the more so since the German sentence uses the same Latin-based adjective ("volitional").

See English examples:

http://www.stpt.usf.edu/hhl/papers/autonomy.htm
"This current debate is important in its own right. It also provides an opportunity to think more generally about the nature and scope of children's autonomy. To answer these practical concerns as well as the underlying general issues, we should distinguish three questions: (1) Do children have the rational and experiential wherewithal to make informed decisions about their futures? (2) Should parents (or guardians) permit children to make decisions about their futures? (3) Should the state legally protect children's prerogative to make decisions about their futures? The first question concerns descriptive autonomy, empirical questions about the intellectual and ***volitional abilities*** of children. The second and third questions concern normative autonomy, questions about how parents and legal authorities should relate to children."

http://www.leeds.ac.uk/educol/documents/000000077.htm
"Empirical support for the role played by volition in human action is provided by Kuhl and Beckman (1994) through an extensive series of experimental studies in which the control of action is explained using a new construct action versus state orientation. The construct is measured using a three-part scale, comprising preoccupation, hesitation and volatility (Kuhl, 1994). Action-oriented individuals demonstrate ***volitional abilities*** that facilitate the planning, initiation and completion of intended activities, they exhibit high self-efficacy (the belief that one can do what one intends to do) and high self-esteem. In state-oriented individuals these abilities are impaired. Eysenck (1995) has raised doubts about the reliability of the scale and the uniqueness of the construct, but concedes that the contribution made by volatility may well be new and that the work has nevertheless been helpful in understanding behaviour in a number of areas. These areas include academic failure and depression which are particularly relevant to the present discussion." (and several other instances in this reference)