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Author Archives: jadetrillium

Inventory Drivers – Service Levels

Inventory driverAt first glance Service Level seems pretty straight forward as an Inventory Driver.  The higher the target service level the higher the inventory required.  For finished goods that is true though there are a number of ways to hold inventory down while increasing service levels.  Some examples would be improved forecast, increased flexibility, higher velocity, decreased lead time, etc.  (Notice that these are all inventory drivers and they all interact with each other.)  But I do not want to talk about service levels for EXTERNAL customers here since we all are used to that particular issue and have current, hopefully effective, tactics in place.  What I would like to draw your attention to with this posting is service levels for INTERNAL customers.  Yes, it is the same discussion as for external customers but somehow most organizations do not seem to consider it in the same light.Inventory Driver Service Level

So who exactly are the internal customers that draw on inventory?  The primary ones are production (raw materials & componentry), sales (samples), marketing (display samples), maintenance (MRO stock) and Quality (samples).  What happens in your organization if you run out of stock and short ship an external customer?  Responses to that can range from a shrug of the shoulders to mass panic and expediting of new material to the customer.  Now, what happens if you run out of stock and short ship an internal customer?  In most cases there is massive wailing and gnashing of teeth by various members of management until the material is acquired and delivered, usually by expediting the material.  Again, you say, not much difference between internal and external.  But this is where things start to diverge.  Because the internal pain is much more obvious (and loud), all the people involved in ensuring stock availability become sensitized to internal stock outs.  This invariably results in raw materials inventory drifting up to ensure no stock outs and since most organizations track the total inventory value (which goes up with the raw material drift) this put downward pressure on the overall inventory level.  This downward pressure is often reflected in the finished goods levels, again because of the previously mentioned sensitivity to shorting an internal customer.  The inclination is to decrease finished goods levels because it is “just” stock that is sitting there waiting for an order while raw material would not be in the warehouse unless there was a production order for it.  Of course, sooner or later this means a customer gets short shipped and the screaming starts up again.  Also, the production orders in the system would not exist if there was not anticipated demand for the finished goods so reducing finished goods levels may not be a very effective plan.  As mentioned at the beginning of this post, the key to getting out of this particular cycle is to reduce the lead time for both finished goods and raw materials replenishment while at the same time improving demand management.  (Easy to say, not so easy to do.)  An effective Lean process is the best way to accomplish this.  For more information on this refer back to the previous postings on Incoming and Internal lead time.  The key to controlling external service level issues is to make sure and include internal service levels in your planning.

Before we close out this topic I just want to redirect your attention back to the MRO (Maintenance, Repair & Operations) stock.  This is material used maintain equipment needed by the organization, whether machinery, trucks, tow motors or whatever.  Often this material is not even included in the overall inventory value or the inventory control processes.  This can be a major mistake as it still represents a (potentially major) expense to the company and there are repercussions both to too much stock or to running out of stock.  So how best to control it?  In all likelihood a Kanban or some variant of the 2 bin system is the best method.  The main reason for preferring Kanban over 2 bin has to do with the notification system that additional stock is required in that it is built into the process (visual notification and pull processing).  A 2 bin system on the other hand requires a person to physically contact procurement and tell them to order more.  In the end you should always try to apply the KISS rules and set up the simplest process that is most likely to be followed.

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.

Next posting we will explore Constraint Management – What is it and why would it affect Inventory Management?  In the meantime, enjoy thinking about Service Levels.  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 – Cycle Counts

Inventory driverWhy do most organizations do physical inventories at least once a year?  Is it because their inventory accuracy is so bad they do not know what they really have in stock?  Is it a way of finding out where the stock is in the facility?  Is it just somebody’s bad idea of a joke?  Actually, the main reason for the annual physical inventory is that the government requires all organizations to report on the value of the organization which includes the inventory value.  An outside financial auditor must sign off on the reported value and if they are not comfortable that the book value is accurate they will require a physical inventory to “prove” the value.  Note that they are interested in the total value, not specific item counts.  This means that if the errors cancel each other out and the total value is within acceptable limits the count will be accepted and entered in the system as the inventory record.  With regards to inventory accuracy, we the inventory control world are less interested in the value and more interested in the specific count of the items.  The value may be right but the counts may be wrong and being short one or more items from the “official” count can create massive problems.  As an example I would refer you to a poem published in the 1700’s by Benjamin Franklin called “For Want of a Nail”.  I won’t go into the full poem but in essence the lack of a nail resulting in losing a kingdom.  Similarly, being short on a count can lead to production or shipment shutdowns and potentially significant costs.  This is why many companies have implemented or investigated Cycle Count programs – they are inherently more accurate and cheaper in the long run than a Physical Inventory.  (By the way, the poem predates Benjamin Franklin and is still around today.  Obviously inventory issues have plagued organizations for a very long time.  I’m sure that at some point a long time ago there was a group of cavemen standing around shouting at some poor stock keeper – “What do you mean there are only 2 spears?  There should be 20!”)Inventory Driver Cycle Count

We have touched on cycle counting a couple of times already in other posts but I wanted to go into this topic in more detail.  While a Cycle Count program is definitely a desirable tool it will not work on its own. Without support from many other factors it will just become an exercise in frustration for everyone involved.   Some of these other factors are timely movement reporting, process discipline, clear material identification, integrated IT systems and dedication to organized storage.  Just to be clear, while fixing the incorrect amounts is important; it is NOT the key to a successful cycle count program.  The key is in identifying the reason for the inaccurate count and putting a fix into the appropriate process to eliminate the reason for the failure.  Cumulatively, all these changes will predispose your process to having and maintaining an accurate count.  The better your accuracy, the less safety stock you will need to ensure acceptable customer service levels.  Reducing inventory will make it easier to maintain a better accuracy level…thereby creating a self-reinforcing positive improvement cycle.   Increased accuracy also reduces numerous other costs such as expediting cost, production and shipping delays, excessive searching for “lost” material and better lot control (especially critical in a FIFO environment).  All of these combine together to make Cycle Counting one of the more important Inventory Drivers when trying to control and optimize your inventory levels.

While I am not going to use this forum to discuss how to set up a cycle count program (contact me directly if you want to discuss that) there are a couple of precursors that I do consider important.  First and foremost, no cycle count program will work well without an embedded and effective Root Cause Analysis culture in place.  By culture I mean a process that is so deeply embedded that everyone in the organization accepts it, is involved in it and believes that it is of critical value to their customers.  Another way to think of it is Continuous Improvement on steroids.  It is even better if Appreciative Inquiry is also part of this process.  (Never heard of Appreciative Inquiry?  Think of it as the mirror image of Root Cause.  If Root Cause can be described as “something went wrong – how do we stop it from repeating”.  Appreciative Inquiry can be described as “something went right – how do we make sure it happens more often”.  Believe me when I say that Appreciative Inquiry is much more difficult than Root Cause but it is also probably more effective for the long term growth of the organization.

The second most important precursor is discipline.  By that I mean everyone having the internal discipline to always do the right thing, no short cuts, and recording all transactions in a timely fashion.  For example, when a back ordered material arrives at the door and needs to be shipped out immediately, the receiving paperwork still needs to be completed before the shipping documentation and both need to be done immediately.  Always keep in mind that the transaction is not complete (and the inventory is wrong) until the paperwork is completed IN THE SYSTEM.  Just writing it down and submitting it for keypunching at a later time is not sufficient.  (While a real time RF system is not a requirement it will definitely improve inventory accuracy.)

The final precursor is similar to the second.  Everyone in the company must have a commitment to cleanliness and organization.  The old saying “a place for everything and everything in its place” sums it up perfectly.  If there are pieces of broken pallets on the floor, anybody (including management) should put them in the garbage, If something is not where it belongs it should be put back immediately.  Floors should be clean and clear, walls should be clean and accessible, machinery should be in good repair and available as needed.  Working conditions influence mind sets.  If the work area is messy and disorganized, people will develop a tendency to take short cuts or not follow through completely.  In the end a company’s culture will decide whether a program such as Cycle Counting will succeed or not.

Are you considering implementing a Cycle Count Program?

Are all the precursors in place in your organization?  Are you ready to implement a SUCCESSFUL Cycle Count program?  Contact Ed White at Jade Trillium Consulting to discuss whether this will help your organization and how best to proceed.

Next posting we will explore Service Levels – How does a customer service measure affect Inventory Management?  In the meantime, enjoy thinking about Cycle Counting.  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

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