by Don Johnston | Sep 12, 2021 | Announcements, Inventory Strategist
This is my first post for some time. That is because I have been concentrating of developing open source software to facilitate improvement of inventory management. Facilities currently available include ABC analysis, service level measurement, ascertaining the scope...
by Don Johnston | Nov 26, 2018 | Announcements, SIMS
Open source service level measurement software is now available. For details, click on the “SIMS” tab. For information about the technique which the software uses to measure overall service level, see my article on that subject.
by Don Johnston | Nov 25, 2018 | Announcements, Inventory Management Basics
I will consider two definitions of service level. One is the probability that the next customer demand will be supplied immediately off the shelf. This definition is often used in theoretical work. It is applicable to both individual items (products) and the entire...
by Don Johnston | Nov 3, 2018 | Announcements, Inventory Management Basics, SIMS
Open source ABC analysis software is now available. For details, click on the “SIMS” tab. For information about ABC analysis, see my article on that subject.
by Don Johnston | Jan 3, 2018 | Uncategorized
The technique described here is called “exponential smoothing”. It is a simple method of updating an average as new data becomes available. It is the basis of most techniques used for forecasting customer demands. It was discussed briefly in the article entitled...
by Don Johnston | Jan 3, 2018 | Announcements, Forecasting
Some incorrect formulae were found in the simulation spreadsheet described in the article entitled “An Educational Inventory Management Simulator”. They have been fixed.
by Don Johnston | Mar 5, 2017 | Forecasting, Replenishment
This article contains information concerning the mathematics involved in the spreadsheets which are described in Part 1. That article was revised on 5 March 2017 and the spreadsheets were revised on 19 February 2017. It is assumed that the readers of this article have...
by Don Johnston | Feb 1, 2017 | Forecasting, Replenishment
Replenishment decisions rely on forecasts of lead times amongst other things. If the mean lead time for an item is not expected to change much then the average of recent lead times for the item can be used. Unless that item is purchased frequently, there won’t...
by Don Johnston | Jan 22, 2017 | Forecasting, Inventory Management Basics, Lead Time Reduction, Replenishment
It is easy to reduce investment in inventory if you don’t mind a deterioration in customer service. Likewise, it is easy to provide good customer service if you don’t mind having a large investment in inventory. Good inventory management is concerned with...
by Don Johnston | Dec 26, 2016 | Inventory Management Basics, Replenishment
I have developed an inventory simulation spreadsheet for educational purposes. It provides two facilities which are not provided by the online simulator which is accessed by means of the “Simulator” tab. The additional facilities are graphs and use of your own demand...
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