The chart method: an overview

The chart method of analysis is the most rigorous of the three methods of analysis identified above. It is a technique that enables the analyst to construct, test, and reconstruct arguments about questions of fact. It requires that the analyst articulate every step in an argument, breaking down the argument into simple propositions, and then mapping or “charting” all the relations between those propositions and the penultimate probanda (or the components of a hypothesis). The logic is simple; the complexity lies in the materials to be analyzed and in identifying the relationships between the propositions in an extensive argument based on a mass of conflicting evidence. The logic is binary: Every relevant proposition either tends to support or tends to negate a single hypothesis or conclusion (the ultimate probandum). The technique is dialectical: The aim of the chart-maker should be to construct the most cogent possible argument for and against the ultimate conclusion and to relate the opposing arguments within a single coherent structure.

The chart method structures the analysis at two levels – the macroscopic level and the microscopic level. The macroscopic level involves structuring the “top” of the chart. The ultimate and penultimate probandamust be determined based upon the law and, usually, restated after the analyst has formulated a provisional theory of the case. The penultimate probanda help the analyst identify which of the main propositions must be established to support each of the penultimate probanda.