Reflect on selector fluency, model trust, and transfer to project rehearsal
Dynamic Method Selection: What You Can Now Do
You built a workbook that switches scenario and method with two controls, updates outputs and KPI tiles automatically, and surfaces checks before recommendations. These habits separate a good spreadsheet from an investor-ready system.
Before this lesson, you could calculate FIFO, LIFO, and Weighted Average by hand. Now you can:
- Switch between methods instantly with a dropdown instead of rebuilding formulas
- Compare turnover and days-on-hand across methods to see operational impact
- Defend a method recommendation with specific workbook evidence
- Audit selector lookups and checks before discussing decisions
Clear KPIs and stable charts help decision-makers see margin, cash, and risk instantly. Your validation and documentation show that the model will not fall apart as data grows. That is the difference between a good spreadsheet and an investor-ready system.
In the next lesson, every student in the class will work with the same shared dataset to rehearse the exact project workflow you will use in Lessons 08-10. Here is what changes:
- Same workbook structure: The sheet layout you built today (Inputs, Drivers, MethodSummary, Outputs, KPI, Checks, Dashboard) carries forward
- Teacher-guided: You will follow the teacher model step by step instead of building independently
- Shared data: Everyone uses the same numbers so the class can compare reasoning quality directly
- Peer audit: You will review a classmate's workbook against a Definition of Done checklist
- Transfer check: You will identify which structures and habits you must carry into the real project
What to bring to Lesson 07: your completed workbook from today, your method defense memo, and any questions about the scenario-switching logic.
Before you leave, confirm you can answer these:
- How does a scenario driver table make a workbook more flexible?
- Why use a composite key for scenario+method lookups?
- What does inventory turnover tell you that COGS alone does not?
- Why should checks sit above the KPI tiles, not below them?
- Which method would you recommend for a business with perishable goods? Why?