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Category Archives: Inventory Management

Inventory Drivers – Key Performance Indicators

Inventory driverAre your Key Performance Indicators destroying your organizational effectiveness?  Sadly, in many companies they are definitely getting in the way of optimal effectiveness.  How can this be true, I hear you say?  After all, the whole point of KPI’s are to enable management to measure and ensure that everyone is doing their job to the best of their abilities.  While that is true it does not take into account the number of times that organizations have conflicting objectives and therefore conflicting measures.  From the very beginning of organizational development thousands of years ago everyone has worked from the theory that if every department is as efficient and effective as possible than the organization will be as efficient and effective as possible.  Unfortunately this just is not true.Inventory Driver KPI

Let’s look at the example of two departments in company A – Production and Inventory Control.  Management has decided on a strategic cost saving change for the company that involves reducing the average inventory value.  Because of the new strategy, new objectives and therefore new KPI’s are set in Inventory Control to meet the new requirements.  They take the easy first step and reduce significantly the amount of Dead & Slow Moving Inventory (DSMI).  They then move on to reducing the raw material inventory but find that this creates problems with production running short of requested material.  In addition they also find that they cannot reduce finished goods inventory as they have no control over the finished goods produced regardless of the production plan.  The reason for both of these issues is that production consistent over produces against the plan which produces overstock in finished goods and uses more raw materials than was planned for.  Upon investigation it is found that the reason for the over production is that there is a policy of only doing changeovers after regular work hours.  This means they keep producing to the end of the day no matter when they finish the quantity ordered.  In order to resolve the issue management decides to change the policy so that production stops and changes over as soon as the proper quantity is produced.  This is wonderful for the Inventory Management group as excess inventory starts to drop quickly, emergency orders for raw material also drop and usage becomes consistent with the plan which means that safety stock can also be decreased which further reduces inventory.  They are now meeting the new measures for inventory levels and everyone is happy now… right?  No, everyone is not happy.  The main KPI measure for production is almost always efficiency and this change would probably cause their efficiency rating to drop significantly so they are not achieving their key measure.  Remember, bonuses (as in money) are almost always tied to the KPI and people pay far more attention to their own paycheque than to the company’s overall effectiveness.  This means that over time production is going to slowly start overproducing again in order to get their efficiency measure up.  As production slowly drift back to the way they were before the change, inventory drifts up, safety stock drifts up, emergency orders drift up, etc.  And as these all drift up, Inventory Management slowly drifts away from their key measure of lower inventory.  All these issues are happening because of conflicting measures between the two departments.

What about all the other departments in the organization?  Do they have any conflicting objectives and measures as well?  Probably as this tends to be a very common issue.  It is absolutely imperative that all departmental objectives and measures within an organization are synchronized with each other.  In the above example, establishing a KPI around conformance to the production plan and giving it a higher rating than efficiency would have eliminated the problem.  Sometimes making one area less efficient makes another area more efficient.  It is how the sum of all the departments efficiencies work out that defines whether a company is optimally effective or not.  This is one of the failures of programs like Lean Manufacturing – sometimes waste is a good thing.  For instance, excess inventory in front of a bottleneck operation is desirable, NOT a waste.  Excess capacity can equal increased flexibility which can be a competitive advantage.  The trick is always in the balance, in understanding how much excess is a good thing and reflecting this in the KPI’s for the organization.

One final point, while much of this is the responsibility of upper management to build a culture of maximum effectiveness by interlocking objectives it is middle management that ultimately has control of each department’s objectives and measures.  If they are not working together to identify and eliminate conflicting measures then it is not going to happen.  This means the organization will continue to limp along, never quite being as good as they can which makes the organization vulnerable to outside competitive pressure.  When it comes to KPI’s the organization MUST look at the bigger picture and not let each individual department set their own goals.  

Having issues with your inventory?

Do you understand what Drivers are biasing your inventory levels to move up or down?  Do you need help understanding and getting control of your inventory?  Contact Ed White at Jade Trillium Consulting to discuss whether we can help your organization and how best to proceed.

Hope you enjoyed this posting.  Talk to your friends and co-workers about their experience and thoughts on this topic, especially what it means for your organization.   And, as always, I would love to hear back on your (and their) thoughts.  Just fill in the comment box below along with your contact information to let me know what you think.flag

Inventory Drivers – Constraints

Inventory driverAccording to the Theory of Constraints a constraint is anything that prevents a process from achieving its goal.  Actually there are usually multiple constraints but the one that has the strongest effect is the one concentrated on.  To use TOC jargon, that main constraint or bottleneck sets the drum beat (or speed) that the process can run.  By using different tools (such as the TOC Thinking Process or Value Stream Maps) each process can be analysed to identify these constraints or bottlenecks.  Once the biggest constraint has been identified, the constraint is improved and then the process repeated to identify the next biggest constraint and improve it.  As you can tell the cardinal rule in TOC is to concentrate on the main constraint for any process as changes to minor constraints will not affect the overall process (the overall process cannot produce product any faster than the speed of the drumbeat constraint).Inventory Driver Constraints

So how do constraints drive inventory levels?  As an example, one of the critical rules of TOC is to never let the bottleneck operation stop.  Any time lost at the bottleneck cannot be made up whereas any lost time in a non-bottleneck operation can be.  This rule causes organizations to set up a stocking point immediately prior to each bottleneck so that even if there is a supply problem the operation will not be shut down.  This, of course, increases overall inventory levels and in far too many cases, even if the bottleneck is improved the stocking point is not removed.  In effect, this locks in the higher inventory levels even though they are not needed anymore.  But wouldn’t removing these stocking points automatically be part of the improvement process?  It should be except that human nature tends to push against it.  In the initial improvement, the inclination is to not touch the stocking point until the improvement has been proved effective (just in case).  By the time it is proven effective most people have moved on to the next problem and removing the stocking point just gets forgotten.  If asked why inventory is so high people tend to reply that the amount is stock is what the computer is calling for and therefore must be the correct amount.  In order to remove the inventory you need to change the routings and production plans to remove the stocking point.

So what are some of the other possible constraints that can affect inventory levels?  While not meant to be an exhaustive list or in any specific order, here are some other constraints that are commonly found in many organizations:

  •  Warehouse space
  • Shipping / receiving docks
  • Logistics
  • Total inventory value
  • Forecast accuracy
  • Lead time
  • Government regulations
  • Equipment
  • Equipment breakdown
  • People
  • Process flow
  • Reporting systems
  • Production plan
  • Crisis Management (Hurricanes, earthquakes, blizzards…)
  • KPIs

As you may have noticed I have talked about many of these as specific Inventory Drivers in previous posts.  And what makes each of these factors a constraint?  Every one of them restricts the smooth flow of product through your organizational processes, creating problems in your value stream.  This is the exact same effect that potholes and bumps would have on the road.  Every time your car hits a pothole or a bump in slows down the car and potentially “breaks” the process.  You can try driving around them but that slows down the journey and probably isn’t terribly effective any way.  So what can we do?  Someone needs to smooth out the bumps and fill in the potholes to give a nice smooth surface to drive on.  The equivalent smoothing process in most organizations is to add more inventory until the problems are buried and the process can be speeded up.  From an inventory management point of view this is NOT an effective response to the problem.  Any or all of these, and many others, may affect your organizational flow until your inventory management becomes effectively uncontrollable.  The trick is to identify them and the effect they are having on your inventory.  Only at that point can you effectively control these drivers and your inventory levels (remove the rocks).

Having issues with your inventory?

Do you understand what Drivers are biasing your inventory levels to move up or down?  Do you need help understanding and getting control of your inventory?  Contact Ed White at Jade Trillium Consulting to discuss whether we can help your organization and how best to proceed.

Enjoy thinking about Constraints and other Inventory Drivers.  Talk to your friends and co-workers about their experience and thoughts on these topics, especially what it means for your organization.   And, as always, I would love to hear back on your (and their) thoughts.  Just fill in the comment box below along with your contact information to let me know what you think.flag

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