Please accept my apology for this delayed reply. The delay, while unavoidable, belies my appreciation for the help that you both offered.
After days away from home and office for family and unexpected customer obligations, I'm finally back in front of a computer to move my Mathematica project along. The example file you sent me, Jerry, is exactly what I was hoping for. I very much look forward to developing the skills to build workbooks like yours. It offers me insight into quite a few of the issues that I was struggling with. For example, I was trying to figure out a way to input expressions into a workbook such that a reader (my customer) can easily follow along (regarding the mathematical models used, not the actual computational execution) while still conforming to Mathematica's input syntax rules. I couldn't figure out how to do both at the same time. Jerry, your example workbook makes it very clear to me how to accomplish this objective elegantly.
Books and Wolfram's excellent help system have been (and will continue to be) very helpful. But these resources tend to be narrowly focused (each article or book section; I'm not belittling the comprehensive range of discreet (limited context) topics covered by Wolfram's help system) and often fail to provide the context/big picture that sample workbooks can provide new users. Looking over the shoulder of colleagues, classmates, TAs, and Profs using Mathematica can teach one all sorts of tips and tricks that aren't easily picked up through Wolfram's help system. I'm taking point on this Mathematica venture at my workplace (no other Mathematica users around) so some of the basics that traditional training materials omit are hard for me to me come by. You both offered me great help here. Thank you.