Concept library
Operations and production planning, explained by doing.
Each topic explains one planning concept from first principles, works a complete example, and then gives you a calculator to change the inputs and watch the plan respond. Free, with no account.
Material requirements planning (MRP)
Gross-to-net netting, lead-time offsetting, lot sizing and multi-level BOM explosion. Run it yourself.
Master production schedule (MPS)
Projected available balance, available-to-promise, time fences and order promising, on an editable schedule.
For students
Every number in the worked examples comes from the same calculation as the calculator, so you can check a hand-worked exercise line by line.
For instructors
Each topic ends with exercises built on its calculator and a citation you can paste into a syllabus or assignment brief. Link to them freely.
For practitioners
The pages state the standard logic and its limits plainly — infinite capacity, fixed lead times, nervousness — so you can check your reasoning against the textbook.
The calculation is the start. The job is the rest.
In ITSPracticing, learners run these calculations inside a simulated organisation — working tools, colleagues who answer their emails, consequences that play out — and are assessed on what they actually did.