The present invention is an apparatus and method for constructing a Constraint-Choice-Action Matrix for making decisions based on constraints. Columns (in one matrix orientation) state conditions. The column header presents a partial boolean expression. Such variable expression may be any object or type, e.g., a number, string, or list. An entry in a cell, selected using a GUI pick-list, combines with the column header, to complete the boolean expression. The set of boolean expressions in a row may be combined into an action boolean statement. If that statement evaluates to true, some action, represented as a row header, is recommended or executed. The matrix is applied to an instance of a context domain, for decision-making. The context domain may be represented in a model representing an instance of that domain (e.g., a product specification for configuration of a machine) in data and rules.