Retail Planning in a Volatile World: The WSSI Approach

Retail planning is unforgiving in a way that manufacturing planning rarely is. A manufacturer can hold finished goods and smooth a bad month. A retailer has finite shelf, finite stockroom and a customer who will walk to a competitor rather than wait. Add a range that runs to thousands of options and the planning problem becomes one of managing choice, cash and space simultaneously.

## What WSSI covers WSSI, the weekly sales, stock and intake plan, is the retail planning backbone. It projects sales by week, translates that into the stock needed to support it, and derives the intake required to reach that stock position. Run properly, it answers three questions every week: how much will we sell, how much will we hold, and how much do we need to bring in. Run badly, it becomes a stock report with a sales column bolted on.

## Why range and option count drives everything Retail demand is planned at the level of the option: the size, the colour, the pack. Aggregating to product level hides the problem, because a product that is 95 per cent in stock overall can still be missing the two sizes that account for most of the demand. Depth of range and breadth of option count are the real drivers of both availability and markdown, and both are decisions the planner can influence before the buy is committed.

## Units, cash and space at once The three views have to be planned together. A buy that works in units may be impossible in a stockroom, and a buy that works in space may destroy the cash position. WSSI is most valuable when it carries all three so the trade-offs are visible in one review: this intake plan delivers the service level, at this markdown risk, within this open-to-buy. Separate plans produce confident answers in three rooms and a problem in the fourth.

## The weekly discipline Retail plans decay in days, not weeks. A weekly cycle that re-forecasts on actual sales, re-checks intake against open orders and adjusts the following weeks is worth more than a more sophisticated monthly model. The discipline is in the rhythm: same day, same data, decisions recorded so the following week can see what changed and why.

## Getting started Most retailers already have the data. What is missing is a single weekly view that joins sales, stock and intake at the option level and is honest about markdown risk. That is not a technology problem so much as a process and data one, and it is worth fixing before anything more elaborate is attempted. See how WSSI retail planning works in sofco, read about our retail practice, or model the financial upside with our ROI calculator.