Under Quebec law the concept underlying a person's "capacity required to make a will" is fundamental since it sets the stage for the freedom of willing. While the concept itself is not new, its presentation in the Civil Code has changed and its jurisprudential interpretation has evolved. As such, the author presents the results of an in-depth analysis of doctrinal issues (i.e. academic writings, laws, norms, and others) and substantive jurisprudence (i.e. case law, precedents, etc.) of the "capacity to make a will". This in turn illustrates the complications that arise when attempting to frame the "typical profile" of a person capable or incapable of giving consent. Faced with this difficulty, the nature of testamentary provisions and the circumstances surrounding the drafting of a testament make possible for the court to have a better understanding of the testator's capacity to consent. Indeed, if the questioning of the testator's free will is not to serve as a pretext for assessing his or her expressed a "wishes", the taking into account of various extraneous factors then allows the court to examine whether or not the content of the testament logically reflects the testator's beliefs, values and other personal characteristics. Decisions thus handed down enjoy the advantage of being more acceptable in so far as they remain coherent with what characterizes and distinguishes the testator. The author concludes with proposals of straightforward tips to assist the court by facilitating the proving of a testator's aptitude to consent.