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ОглавлениеChapter 1
Introduction to Smart Inventory Solutions
Achieving True Inventory Optimization
The optimization of materials and spare parts holdings has, for many years, been a goal of inventory managers, operations managers, and financial managers. This is particularly so in industries with significant investments in these types of inventory and is often driven by both a need for operational support and a need to free up working capital. The benefits that come from achieving materials and spares inventory optimization are such that the business case for action is irrefutable.
The problem is that, until now, the techniques that have been applied to achieve the optimization of this inventory do not result in a truly optimal outcome. At best they provide short-term changes; at worst they lull people into a sense of operational excellence when nothing could be further from the truth. When subject to critical analysis, the reasons for this become quite obvious. Let me explain.
Traditionally, one of two approaches has been applied: either undergo data analyses using a statistically-based software algorithm, or select a single criterion (such as obsolescence) and look for inventory that meets that criterion. Both of these approaches overlook one simple fact.
High levels of materials and spares inventory are a symptom of the broader issues with the way the inventory is controlled, supplied, accessed, purchased, and managed. Inventory levels are determined by a combination of supply chain management, internal policies and processes, and people’s behavior and training. These issues involve a wide range of personnel who come from engineering, maintenance, stores, inventory management, procurement, and even finance. Achieving true inventory optimization and lasting results requires an understanding of all the behaviors, context, and process factors that influence the inventory. Addressing high levels of materials and spares inventory through traditional inventory review and ‘optimization’ techniques does not address these issues as it rarely involves the range of personnel that influence the outcomes and does not improve the company systems and knowledge to address these issues in the future.
Neither software algorithms nor single criterion solutions address the full range of possibilities and so they cannot possibly provide true optimization. The short-lived gains they do achieve will, most likely, be reversed when the focus is taken off the immediate project and the operational processes and behaviors once again influence the inventory levels.
Achieving true inventory optimization requires a new, innovative approach that combines knowledge of parts usage, procurement, and supply chain issues with a review of behaviors and the management processes that drive them. This approach is known as the Inventory Process Optimization™ Method.
This second edition of Smart Inventory Solutions expands on the key material of the first edition to encompass and explain the Inventory Process Optimization™ Method. In doing so it also explores the supply chain, policy, process, people, and behavior issues that must be addressed for the achievement of true inventory optimization.
Inventory: The Forgotten Investment
Materials and inventory management is one of the most important disciplines in almost every company. Inventory can provide the capability to fulfill a customer need, repair a broken machine, assemble products for sale, or just keep production going. Yet, inventory management is widely perceived to be one of the most boring management topics there is. Mention inventory management to most people and almost immediately their eyes begin to glaze over. In fact, someone once suggested to me that the title of this book should be: Inventory: More Exciting Than It Sounds!
However, consider this: for manufacturing organizations, inventory can account for up to 50% (or more) of the current assets of the business (see Appendix A for a glossary of terms used in this book). This means that for most manufacturers, up to 50% of their assets that could convert to cash in the next 12 months are tied up in inventory. For retail and wholesale businesses, the figure is even higher. While materials and spares holdings typically do not reach these values in terms of percentage of assets, a large number of organizations have millions and even tens of millions of dollars tied up in this type of inventory. Some larger organizations with which I have worked even have hundreds of millions of dollars tied up in spares.
The problem is that, unlike cash, the money tied up in this type of inventory is not available for any other use. It cannot be used to fund the business or for further investment in other productive assets. With engineering spares, this problem is even more exaggerated as the inventory is not purchased with resale in mind. The funds spent on this type of inventory are essentially gone; there is little probability of a genuine return on investment. Unlike receivables, this inventory does not represent a defined future stream of income. (The exception to this issue of resale revenue is the combination of wholesalers and final suppliers of parts who do sell their inventory. However, the ideas and processes in this book do apply equally to them.)
Despite these obvious financial issues, and the quantum of funds that are invested in this inventory, engineering materials and spares inventory management isn’t a serious business topic for many people. This inventory is something that trades people and engineers stress over, accountants count, or stores people store. Many people in business concern themselves only with strategy or sales or process management or IT solutions because these are seen as high profile and ‘sexy.’ At the other extreme, some people consider inventory only as a means to an end. The attitude is to stock more ‘just in case’ but the cash impact of this is not always fully appreciated. Inventory management, it seems, is considered by many to be an activity at too low a level to create genuine financial advantage because changes in this area don’t directly affect operating budgets or profit. By definition, the working capital tied up in this inventory is a cash expense that does not appear on the ‘Profit and Loss’ statement. Therefore, it gets little attention.
This is why engineering materials and spare parts really are the forgotten investment.
Inventory Process Optimization™
The Inventory Process Optimization™ Method aims to cast inventory in a different light. Taking a proactive approach to optimizing processes can provide significant financial advantage and enable companies to free up millions of dollars in cash. This is money that has been invested in inventory, but which either wasn’t needed in the first place or is no longer needed due to a change in the market or operating environment. These changes could include a change in the level of demand, a change in the ability to supply, or both. In either case, there is an opportunity to free up cash and make alternative investments.
This book addresses the range of issues faced when managing inventory and details an approach to inventory review and reduction that has been proven to work and deliver results. Using the processes presented in this book, one company recently achieved an $18M inventory reduction in a little over 14 months. This represented a 36% reduction in the total value of their inventory. Importantly, they generated a $24M improvement in cash flow which they then invested in business improvements projects. These benefits were achieved with no loss in operational integrity, no capital investment, and no significant use of external resources. There are few investments of time or money that can match that kind of return!
By following the process and actions set out in this book, you too can implement some smart inventory solutions and achieve true inventory optimization.
Management, Reduction, or Optimization?
In all fields of management, the language and terms that are used evolve and change over time. Sometimes these changes reflect a broadening in expectations, such as the evolution of ‘maintenance’ into ‘asset management.’ Sometimes it is an innocent confusion that results from widespread use. And sometimes, it is a deliberate obfuscation by people in order to gain advantage by making the simple look complex or vice versa.
In my experience the terms inventory management, inventory reduction, and inventory optimization are frequently interchanged and misrepresented. For the sake of clarity, the following are the ways in which these terms are used in this book. Understanding these terms in context will help take us on the first step towards understanding why process optimization is the real issue in improving inventory outcomes.
Materials Management
Think of Materials Management as the top level process for control of all materials. This includes the recognition of need, estimating requirements, purchasing, and logistics of supply. Some materials may be purchased for immediate use and so will not end up as inventory
Inventory
Inventory can be defined as: All materials and spare parts that are held for future use without knowing exactly where and/or when the item will be used. This definition is discussed further in Chapter 2.
Inventory Management
Inventory Management is the activity that ensures the availability of inventory items in order to be able to service internal and/or external customers. In an operational environment, the customer will be the maintenance and production departments; in a finished goods environment, the customer is the external customer. Inventory management involves the coordination of purchasing, manufacturing, and demand to ensure the required availability.
As inventory management aims to ensure availability, the focus, almost invariably, is on the minimization (or even elimination) of stockouts. That is, minimizing any occurrence where there is not sufficient stock to meet demand. The logic that drives this behavior is as follows: Running out of inventory has consequences and there always seems to be a need for blame. Being blamed for something is an unpleasant experience for most people and in extreme cases can be seen as ‘career limiting.’ Therefore, any stockout triggers an action, not only to restock but also typically to overstock, in order to avoid the negative consequences of the stockout. If the inventory is already overstocked, for whatever reason, there may not be a stockout to trigger a need to take action. Therefore, there is no signal that a problem exists. A company may be overstocked and never perceive that it has a problem. Hence, a specific program of activity is required to identify these items so that their stocking can be adjusted to more appropriate levels. The result of this approach is overstocked inventory.
From this description we can already see that the traditional approach to inventory management involves processes that drive behaviors that systematically overstock inventory. This is why so many companies are overstocked.
Right now, I know that the purists will be saying, ‘Wait a minute, we can put in signals to indicate overstocking such slow-moving stock indicators.’ However, the practical reality is that these flags are rarely acted upon until the overall value becomes too large to ignore!
Inventory Optimization
Inventory optimization is an analytical technique that uses historical data and theoretical formulae to calculate the required level of inventory for a desired level of availability. Inventory Optimization can be a very attractive approach because it is ‘fact based.’ However, this strength is also its weakness because quality data is so hard to achieve (more on this in Chapter 9).
Also, by its very definition, this approach must assume that all of your existing conditions and processes are fixed; otherwise, the calculations cannot be completed. This means that Inventory Optimization does not and, in fact, cannot address the process and behavior issues that actually drive your inventory outcomes. For these reasons, Inventory Optimization can never be a solution to your inventory problems. It can only ever be a tool that is used as part of a wider program of review and then it must be used with caution.
Inventory Reduction
Inventory reduction really is just a goal. It is not a technique or a process. For example, retailers many have an ‘Inventory Reduction Sale’ where they sell unwanted stock at low prices. With engineering materials and spares inventory, the goal might be to reduce the level of investment in inventory (that is, the working capital or cash that is tied up) without negatively impacting the operational results.
Inventory Process Optimization™
Inventory Process Optimization™ addresses all of the shortcomings from the above. By combining inventory management fundamentals with optimization techniques, and utilizing systems thinking (Chapter 4), double loop learning (Chapter 8), and hypothesis driven analysis (Chapter 8), this approach systematically addresses process and behavior issues while identifying the specific inventory items to work on to achieve the goals of inventory reduction.
Inventory Process Optimization™ challenges the constraints to improvements in inventory to ensure that the result is an improvement to ‘what could be,’ not just a recalculation of ‘what is.’ So, while, Inventory Management must eventually lead to an over-investment of cash in inventory as people seek to eliminate stockouts, Inventory Process Optimization™ results in a sustainable and lasting minimization of the investment of cash while maintaining the availability promise. Although this difference may seem subtle, the impact is significant. Chapter 9 of this book takes you, in detail, through the Inventory Process Optimization™ Method.
Modifying your systems to improve your materials and spares inventory management performance is of little value if the results don’t last. In fact, the use of resources in a program that doesn’t deliver lasting results could be viewed as a waste of company resources. Similarly, an inventory reduction in one year is of only minor value if the cash is then put back into inventory in the next year — this is sometimes referred to as a ‘yo-yo’ effect. That is, great initial results and then, without other changes in the management of inventory, the initial results are reversed as the inventory is restocked. The yo-yo effect is typically the outcome of attempts at inventory reduction that don’t focus on achieving lasting results through identifying and changing the real drivers of high inventory levels.
Ensuring that the gains achieved are lasting and sustainable requires the training of your team, consistent application of the process, a review of policies, procedures, metrics and measures, and changes in the reporting used for inventory management. It is only by following this path that a company-wide, lasting result can be achieved.
To assist you in achieving lasting results, Chapter 10 works through the execution of a program of inventory review and Chapter 11 works through some case studies showing short- and long-term results as well as some of the hurdles to implementation. Achieving lasting results requires more than just an understanding of Inventory Process Optimization™ techniques and processes. It also requires an understanding of the management systems that drive your inventory outcome and the implementation and tracking of the actions that you will develop from reading this book.
Henry Ford once said, ‘If you think you can do something and if you think you can’t, in either case you are probably right.’ If you genuinely believe that no change is possible, then you are unlikely to drive a successful result. Remember, though, that to believe that no change is possible is to believe that your system is perfect and unchangeable. How likely is it that this is true?
If you recognize that past assumptions may no longer be valid, that the world changes, and that your own efforts in supply chain or operational improvement have changed the dynamics of supply and demand, then the Inventory Process Optimization™ Method is for you.
This book has been designed and written to provide you with the insight, understanding, process, and tools to improve your materials and spares inventory management performance, free up significant cash, and achieve lasting results.