What Is a Master Production Schedule Bucket (MPS Bucket)?

A master production schedule bucket is a fixed time period, one Day, one Week, or one Period, used to group demand, supply, and planned build quantities into a single row of the plan. Every order, forecast, and receipt that falls within a bucket's date range is summed into that slot. Bucketing is what makes the schedule time-phased: rather than a continuous stream of individual events, the plan shows, period by period, how much you need and how much you will have.

This entry defines the MPS bucket and shows how it behaves inside EDGEBIC by User Solutions. For the wider index of planning terms, see the manufacturing glossary, and for the balance that rolls across buckets, see projected available balance. For the broader concept of a master schedule, see the generic master production schedule guide; this entry takes the planner-facing view of the bucket itself.

How it works

A bucket is a weekly budget envelope. Every expense that lands in a given week goes into that week's envelope, and at the end of the week you look at one number, not a scattered list of receipts. A master production schedule bucket does the same for stock: all the demand and supply for a period fall into one envelope, and the plan reads one row per envelope across the horizon.

Three bucket sizes cover the common planning rhythms:

• Day. Each bucket is one calendar day. Best for high-velocity items where within-week timing decides whether you stock out.
• Week. Each bucket is seven days. The usual default for a build plan, balancing detail against readability.
• Period. Each bucket is a longer custom span, often about a month, for coarse long-range planning where day-level detail would only add noise.

Each bucket has an inclusive start and an exclusive end, and every demand or supply event is placed by its date into exactly one bucket. The bucket size changes only the resolution of the view, not the underlying data. View the same product in Day buckets and you see fine timing; view it in Week buckets and the picture smooths into fewer rows. Because the choice is per view, a fast consumable and a long-lead casting can each be looked at through the bucket that suits it.

A concrete example

Widget A is planned in Week buckets, opening with 80 units on hand. Two confirmed orders are due next week and one the week after, with a small weekly forecast:

Each row is one weekly envelope. Week 2 sums all of its demand into a single 60 and shows the balance dropping to minus 10, a projected stockout for the week. That is enough resolution to plan a build. But if Widget A moved fast and its within-week timing mattered, a Week bucket could hide a mid-week gap: a receipt due Friday and demand due Monday would sit in the same envelope and appear to offset, masking four days of shortage. Switching to Day buckets would split that week into seven rows and expose the early dip. The bucket size is the lens; choose the one that shows the timing you actually need to manage.

How EDGEBIC uses it

In EDGEBIC, the bucket is the fundamental row unit of both the Inventory Calendar and the master production schedule grid. A planner selects a product and a bucket granularity of Day, Week, or Period, and the grid groups all demand, supply, and planned quantities into buckets of that size, rolling the projected balance and available-to-promise across them. In the master production schedule, one bucket for one product is one row, carrying its firm demand, forecast, gross requirements, scheduled receipts, projected balance, available-to-promise, and the planner's committed build quantity.

Bucket dates are also the key that ties the plan to committed builds. A master schedule entry is stored per product and bucket date, so when a planner commits a build quantity to a bucket and firms it, the resulting build-to-stock order is pegged to that bucket. Time fences are evaluated against bucket start dates too, deciding for each bucket whether only firm demand counts and whether the system may auto-suggest. Changing the bucket size re-groups the view on the next load without altering the underlying orders or forecasts.

For the full grid with buckets, fences, and firming worked through, read EDGEBIC master production schedule explained. To understand the committed demand each bucket carries, see firm demand in planning, and for how bucket boundaries interact with the near-term plan, see the time fence.