James Madison was well aware of the importance of taking careful notes at the Constitutional Convention. From his "Preface to Debates in the Convention of 1787":
"On the arrival of the Virginia Deputies at Phila it occurred to them that from the early and prominent part taken by that State in bringing about the Convention some initiative step might be expected from them. The Resolutions introduced by Governor Randolph were the result of a Consultation on the subject; with an understanding that they left all the Deputies entirely open to the lights of discussion, and free to concur in any alterations or modifications which their reflections and judgments might approve. The Resolutions as the Journals shew became the basis on which the proceedings of the Convention commenced, and to the developments, variations and modifications of which the plan of Govt proposed by the Convention may be traced.
The curiosity I had felt during my researches into the History of the most distinguished Confederacies, particularly those of antiquity, and the deficiency I found in the means of satisfying it more especially in what related to the process, the principles, the reasons, & the anticipations, which prevailed in the formation of them, determined me to preserve as far as I could an exact account of what might pass in the Convention whilst executing its trust, with the magnitude of which I was duly impressed, as I was with the gratification promised to future curiosity by an authentic exhibition of the objects, the opinions & the reasonings from which the new System of Govt was to receive its peculiar structure & organization. Nor was I unaware of the value of such a contribution to the fund of materials for the History of a Constitution on which would be staked the happiness of a people great even in its infancy, and possibly the cause of Liberty throught the world."