Specific Identification and Weighted Average
Students learn the third and fourth inventory methods with the same calculation-first, textbook-first scaffolding used in Lessons 2-3. They should understand WHY these methods exist and WHAT kinds of businesses use them BEFORE any workbook build happens in Lesson 5.
- ▶Identify business contexts where Specific Identification is the appropriate inventory method
- ▶Identify business contexts where Weighted Average is the appropriate inventory method
- ▶Calculate Cost of Goods Sold and Ending Inventory using Specific Identification
- ▶Calculate Cost of Goods Sold and Ending Inventory using Weighted Average
- ▶Compare all four inventory methods (FIFO, LIFO, Specific ID, Weighted Average) and explain when each is appropriate
This lesson follows a structured 6-phase learning model designed for authentic project-based learning.
Hook
Discover why not every inventory method fits every business. Sort methods to business contexts and establish the key distinction between traceable items and pooled costs.
Introduction
Teacher models Specific Identification step by step using a small inventory of unique, tagged items. Focus on exact-item tracking, not flow assumptions.
Guided Practice
Teacher and students solve a Weighted Average scenario together with visible running totals and explicit rounding rule support.
Independent Practice
Students complete two independent practice tasks (Specific ID and Weighted Average), then synthesize with a four-method comparison matrix.
Assessment
Multiple-choice exit ticket checking method recognition, method fit, specific identification logic, and weighted average calculation including rounding.
Closing
Reflect on which method felt intuitive vs difficult, preview Lesson 5 workbook construction, and surface confusion points before Excel work begins.