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SCSupply Chain Ideas
8-HOUR STUDY & PRACTICE PLAN · TEXT ABOUT 20 MINUTES

Join five planning tracks into one release

Trace demand through stock, supply, constraints, and a dated production release.

The hours include the activities below, not just reading this page. Work at your own pace.

Start with something familiar

Planning a large picnic involves more than choosing a cooking order. You first count guests, subtract food already available, confirm what can be bought, check the stove, and arrange transport. A perfect recipe sequence cannot fix missing ingredients. The Northstar capstone follows that same chain. Each planning step supplies a different fact, and the final release is credible only when those facts refer to the same demand and timing.

Reconcile the quantity before the clock

Northstar expects fifty-one bottles of demand next week and has six bottles of separate prior backlog. Eighteen usable bottles are on hand and ten arrive before demand. Net new need is twenty-nine. A forecast that already includes a customer order must not have that order added again. This reconciliation is the demand and inventory handoff.

The supply handoff checks executable quantities. Supplier availability is twenty-four, manufacturing can support thirty-two, and shipping can handle thirty. In this simplified comparison all three figures mean finished-good equivalents available for the same week. The smallest is twenty-four, leaving five of the twenty-nine net requirement uncovered before recovery. Machine time cannot manufacture missing input availability.

Distinguish capacity from yield allowance

For a conditional plan that recovers enough inputs, expected yield is ninety-seven percent. Thirty starts give twenty-nine point one expected good bottles, so thirty starts are the rounded planning quantity for a need of twenty-nine. Expected output is an average, not a promise that this particular batch yields enough. Add a quality-count checkpoint before shipping.

Each start uses twelve minutes. Thirty starts consume three hundred sixty run minutes. One thirty-minute setup makes total load three hundred ninety within a four hundred eighty minute usable shift. The ninety-minute headroom is time, not finished inventory. Keep the unit labels visible so no one treats it as ninety extra bottles or as a cure for the original supply gap.

Turn the plan into conditional instructions

The recovery scenario provides thirty physical input units before shift start, each sufficient for one bottle start. This is a separate approved scenario from the original finished-good-equivalent limit. Show the change in assumptions explicitly. Run setup zero to thirty and production thirty to three hundred ninety, then count actual good output.

The five-track chain is demand planning, inventory planning, supply planning, constraint planning, and production scheduling. Scheduling accepts their reconciled outputs, assigns time, and returns feasibility exceptions. The capstone does not claim the earlier plans are perfect. It teaches a traceable conversation in which a missing input, changed promise, or yield loss is visible before a release becomes a customer commitment.

  1. Validate inputs
  2. Place legal work
  3. Check every resource
  4. Compare outcomes
  5. Release with conditions
Trace demand through stock, supply, constraints, and a dated production release.
FICTIONAL WORKED EXAMPLE

Northstar worked schedule

All data are fictional. Time is elapsed minutes from the stated shift origin; unlisted transfer times are zero. Use the explicit resource and setup assumptions below.

InputValueUnit or timing
Demand51bottles next week
Separate backlog6bottles
Usable stock18bottles
Receipt10bottles before demand
Supplier/manufacturing/shipping24 / 32 / 30good-unit equivalents same week
Recovery inputs30physical start units before shift
Yield/run/setup/shift97% / 12 / 30 / 480fraction / minutes per start / minutes / minutes
  1. 1. Net need =51+6-18-10=29 bottles.
  2. 2. Original shared flow ceiling=min(24,32,30)=24; uncovered need=5.
  3. 3. Conditional recovery starts=ceil(29/0.97)=30; load=30×12+30=390; headroom=90.

Original plan has a five-bottle gap. Recovered-input plan fits the shift, but shipment of29 new bottles depends on actual accepted output.

Assumptions

  • All times and quantities are deterministic inputs unless explicitly labeled expected or scenario-dependent.
  • Operations cannot be split; touching interval boundaries are allowed. Additional constraints are only those stated in the lesson.

Where this can fail: These small cases teach traceable decisions, not a promise of performance in an unmodeled plant.

TRY IT YOURSELF · 8-HOUR ACTIVITY BUDGET

Build, test and explain a plan

Build a five-tab or five-section plan using only the table. Show original supply limit and conditional recovered-input plan separately. Stress receipt delay so the10 bottles arrive after demand; then separately reduce usable shift to360. Finally use actual accepted output28 from30 starts, with original on-time receipt. No hidden overtime, extra supply, or stock is allowed. The eight hours are self-paced estimates for modeling, scenario work, checks, and explanation; they have not been experimentally validated.

Use paper or a spreadsheet. The estimates below include the study and worked example already on this page.

Estimated hoursActivity
0.5Study the lesson and make a one-page input dictionary. Define the clock, units, resource names, release rule, and all assumptions. Mark which inputs are fixed and which will change in the scenarios.
0.5Reproduce the worked example without looking at its result, then compare every intermediate start and finish. Explain any difference in a short error log before building the larger table.
3Build a complete operation-by-operation planning table for every requested sequence or scenario in the lab brief. Include starts, finishes, blocked intervals, due comparisons, and a resource timeline. Cross-check each row against its input and reconcile resource totals. Use paper or a spreadsheet; no special software is required.
2Run the specified stress cases independently, restore the base between cases, and compare each changed result with the original. Create a small sensitivity table and identify which assumption caused each difference. Audit feasibility before ranking the outcomes.
1Write a decision memo with the selected feasible option, numeric evidence, the losing option’s advantage, and any unmet promise. State the condition that would cause you to reconsider. Do not invent additional capacity or missing data.
1Teach the result aloud or in writing to an imagined operator. Rebuild one key check from a blank page, answer the recap questions, and revise the memo if your explanation reveals an unsupported assumption.

Your deliverables

  • Input dictionary and checked schedule table.
  • Scenario comparison with job-level or quantity-level evidence.
  • Decision memo and teach-back record.
Check your practice work
  • Delayed receipt makes net need39; original limit24 leaves15. Recovery input cap30 cannot cover39; expected good29.1 is below39.
  • A360-minute shift fits floor((360-30)/12)=27 starts; expected good26.19, below29.
  • Actual good28 plus stock18 plus receipt10 yields56 against total57; one bottle remains unfilled.
  • Original recovery load390 leaves90 minutes; all supply recovery and actual quality acceptance must precede a firm shipping commitment.

Keep these three ideas

  • Trace demand through stock, supply, constraints, and a dated production release.
  • Which constraint or metric changes the choice in this case?
  • What assumption must be confirmed before this plan can be released?

Common mistakes

  • Comparing plans before checking every stated constraint.
  • Changing several assumptions at once and losing the explanation for the result.

Optional video study

Trace demand through stock, supply, constraints, and a dated production release.

  • Introduce the specific Northstar inputs
  • 1. Net need =51+6-18-10=29 bottles.
  • Original plan has a five-bottle gap. Recovered-input plan fits the shift, but shipment of29 new bottles depends on actual accepted output.

First half of module narration

Open the module media & quiz

Put this idea to use

Carry your assumptions into a practical tool, then compare your result with a short guide.

Open a related planning toolRead the related planning guidePractice with the planning game

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