Algebra : Form and Function was designed based on the fundamental goal for a student to foster understanding of algebraic structure - that is, an understanding of how the arrangements of symbols allows us to predict, for example, the behavior of a function or the number of solutions to an equation. Mastering algebraic structure enables students to read algebraic expressions and equations in real-life contexts, not just manipulate them, and to choose which form or which operation will best suit the context.  It facilitates being able to translate back and forth between symbolic, graphical, numerical, and verbal representations.
By balancing practice in manipulation and opportunities to see the big picture, Algebra: Form and Function offers a way for teachers to help students achieve real mastery of algebra.