Continuous Improvement

Abstract

CI is a broad concept in regard to possible application in every company that is eager to implement the transformation philosophy. Hence, there are multiple systems, methods, philosophies, tools, techniques, theories and strategies by which Continuous Improvement can be achieved. Due to the length limitation of this article, the Kaizen philosophy/method and Just-In-Time production system have been chosen for investigation. Methods such as Six Sigma, Theory of Cconstraints (ToC), Agile and Deming's wheel also possess major significance in applying Continuous Improvement but will not be examined in this article.

History and definition

Figure 1: Shewhart’s cycle

Continuous Improvement (CI) is a transformation philosophy that is correlated directly with certain methodologies and strategies executed that provide with constant enhancement and development of services, products, and processes . It also aims at minimizing cost reduction for companies and businesses and eliminating root causes of problems. This concept often named as Continuous Improvement Process (CIP) is implemented to increase the company’s profit and competitiveness in the short term in addition to sustain these in the long term . William Edwards Deming (October 14, 1900 – December 20, 1993) is generally considered the father of Continuous Improvement, however the person behind the first breakthrough correlated with CI was Walter Shewhart. He is considered one of the first pioneers of Total Quality Management (TQM) . He developed the straight-line process in 1939 in terms of statistical control for specification, production and finally inspection regarding quality control (QA) for products. The method was transformed to a circular model called Shewhart’s cycle the same year . The model was then modified by William Edwards to the Deming Wheel that himself presented in 1950 to an eight-day seminar in Japan sponsored by the Japanese Union of Scientists and Engineers (JUSE) .

Figure 2: Deming's wheel

Masaaki Imai the famous inventor of Ky-zen (good-change in English) states in his book ‘’ Kaizen (Ky’zen), the Key to Japan’s Competitive Success’’ that Japanese executives reformed Demings wheel to the Plan-Design-Check-Act (PDCA) tool . Deming, nonetheless, kept himself distant from the tool and after thirty years in 1980 he introduced the Plan-Do-Study-Act (PDSA) cycle . While Continuous Improvement can be broad and abstract, it has its roots in manufacturing. Other concepts that it can be affiliated to are quality control, operations analysis, management and mostly anything that includes processes. Finally, CI is defined by Aristide van Aartsengel and Selahattin Kurtoglu as ‘any state of “being” beyond the state of “becoming.” It is the highest stage of maturity that an enterprise business as a whole can attain. Attaining this highest stage of maturity does not happen overnight; it takes time!'

Kaizen

Introduction

Kai-zen (change-good translates to improvement in Japanese) is defined both as a philosophy and a method. It originates from Masaaki Imai in Japan while being one of the most famous CI methods globally in lean production. This philosophy can be applied to all corporate functions in a company although being closer to design, production and market . Masaaki Imai defines it as our way of life be it our working life, our social life, or our home life deserves to be constantly improved . It targets ongoing/continuous improvement involving all levels of hierarchy (top management to workers) . The development of Kaizen is gradual or inch by inch rather than executing major steps. In addition, it does not require huge investment capitals yet calls for extensive continuous effort and considerable commitment that can entail positive results. Lastly, the management principles that are commonly known as Total Quality Control (TQC), Zero Defects (ZD), Just-in-time (JIT) and Kamban (signboard) are used constantly under the Kaizen way of life and are important tools for the application of Kaizen.

Important concepts

Management should be in state to implement the following significant concepts to apply the Kaizen strategy by introducing a very concise policy statement.

• Kaizen and Management.

The two important functions that management should attend regarding Kaizen is maintenance and improvement. Maintenance is achieved through executing activities that sustain the current situation as well following the SOPs (standard operating procedures). On the other hand, improvement relates to all the actions taken to enhance the current standards. Moreover, improvement is classified as Kaizen or Innovation. The former refers to minor constant improvements over time, which is the philosophy followed in the east, while the latter is a result of breakthrough investment in technology or equipment followed mostly by the west.

• Process vs Result.

Another important principle is the consideration of imperfection in processes in terms of always having space for improvement. In addition to the process-oriented mentality adopted, Kaizen strictly considers that firstly a process must be improved in order to get better results. This approach should accompany every tool application.

• Executing the Plan-Do-Check-Act (PDCA) cycle and Standardize-Check-Do-Act (SCDA) cycle.

Kaizen uses two very identical and important tools to serve as maintaining and improving factors regarding the standards. As any process must be initially standardized to be in a state of improvement, the use of the SCDA cycle achieves stabilization in the process. In the famous words of Taiichi Ohno ‘Where there is no standard, there can be no Kaizen’. In other words, the SDCA cycle is applied when there is no available standard. While the outcome of a process can be known, lacking standards results in inconsistency and instability in the process itself. Hence, the SDCA cycle contributes to the creation and maintenance of standards and processes.

Figure 3: SDCA cycle

The figure above explains the SDCA cycle. ‘Standardize’ refers to establishment of the standards that are to be achieved. This action is executed collectively by all employees responsible for the task or the process. The formal writing of the standard is done by the supervisor or the team leader. Next, the step ‘Do’ refers to the execution of the second step, namely the standard . After that, the evaluation of the previous application in terms of meeting expectations is ‘Check’. In the book ‘Gemba kaizen a common-sense approach to a continuous improvement strategy’ when a deviation from the standards occurs, this procedure is also followed by questions as ‘Did it happen because we did not have a standard?’, ‘Did it happen because the standard was not followed?’, ‘Did it happen because the standard was not adequate?’. These questions lead to proper establishment of the standards. Lastly, in ‘Act’ reviewing, assessment of the deviations and implementation of the corrections occurs.

Figure 4: PDCA cycle

Subsequently, when the current process or task has been standardized and is in a state of control, the execution of the PDCA cycle occurs to improve the current performance of the process and create new standards for application. Firstly, ‘Plan’ is the action taken regarding the initialization of the target for improvement. ‘Do’ and ‘Check’ are performed in the same manner as in SDCA cycle. Finally, ‘Act’ is the wide-scale application to prevent the initial problem from happening and/or defining the goals for new improvements .

• Prioritizing quality.

Out of the three most important KPIs of quality, cost and delivery (OCD) in a product or a service handling, quality should always possess the strongest priority. This is an immediate result of the importance of delivering high quality to customers in regard of enhancing competitiveness due to that. Making compromises in delivery times or costs should not be considered as a solution. That, however, requires resilient dedication from the management as the aforementioned options can be considered as alternatives risking as such the assurance of the high-quality deliverables of the product and the company’s life.

• Speak with data.

Kaizen identifies itself as a problem- solving procedure. The gathering along with the analyzation of the data must be implemented to fully recognize the situation and be in a state which the company can be correctly solved. Intuitive approaches such as hunches or feelings are not considered relevant thus lacking science in approaching the problem. The starting point in improvement begins in the collection of data clarifying the focus area that needs to be addressed.

• Considering the customer as the next process.

The axiom ‘the next process is the customer’ means that the next process should be always considered for the customer. All tasks are a series of processes and every process has a supplier and a customer. As customers we identify two types internal that are withing the company and external that belong out in the market . The majority of people working in a company will relate to internal customers. The axiom mentioned before creates a commitment that a defective part or handling of inaccurate information should never proceed to the next process. The end-result concluded by following this concept is that the external customer receives a high-quality product or service.

Application

Important kaizen systems

To achieve the kaizen strategy, the following systems should be introduced and executed.

• Total Quality Control/Total Quality Management (TQC/TQM).

These two systems do not only affiliate as quality-control activities but as strategies to help management in augmenting competitiveness and profitability by improving all aspects of the business. In these systems quality inherits the highest importance however, there are more variables to be considered as cost and delivery. Furthermore, everybody is involved in the organization by the TQC/TQM systems and that is expressed by the ‘T’ which means total. On the other hand, ‘C’ expresses control or process control. The key processes must be realized and then establish control and continuous improvement in order to achieve better results. The management should set up a plan to check the process versus the result to improve the process, not to criticize the process judging from the result. Activities that belong to TQC/TQM are policy deployment, building quality assurance systems, standardization, training and education, cost management and quality circles.

• Just-in-Time Production System.

This system was originally created by Taiichi Ohno at Toyota Motor company. It is defined as ‘bringing the exact number of required units to each successive stage of production to the appropriate time’ . The purpose of it is the direct elimination of all kinds of waste (muda) or non-value adding activities while structuring a lean production system with the ability to deal with uncertainties regarding customer quotes. Muda can be classified as:

1. Waste time spent at the machine

2. Waste involved in the transportation of units

3. Waste in processing

4. Waste in taking inventory

5. Waste of motion

6. Waste in the form of defective units

7. Overproduction

Kamban is used as a communication tool in this system. Kamban also known as signboard, is a visual card attached to each box of parts headed to the assembly line. Upon delivering all components, is returned to the previous task or workstation serving as a record of implemented work and ordering of new parts. Moreover, principles included in the system is to never pass defective work to the next station along with ‘Jidhoka’ which inherits tasks such as the closure of the line whenever a defective part is identified. Toyota has achieved that via possessing machines with automatic stop mechanisms . For example, ‘Throughout the Toyota plants, the visitor will notice large signboards hung from the ceiling. When an individual machine has stopped, the machine's identification number is lit up on the signboard so that the operator knows which machine needs attention’. The advantages of this system relate to shortened lead-time, reduced time spent on non-process work, reduced inventory, better balance between different processes and problem clarification. Representing as such the efforts for continuous improvement in production and inventory resulting in Toyota having a capital turnover ratio ten times bigger compared to American manufacturers.

• Suggestion System for Improvements.

Another significant system that is adopted in kaizen, is the fact that there is a suggestion system incorporated in the company’s structure. Distribution of rewards for employees that try to tackle daily problems and obtain savings from these suggestions or meet managerial criteria is a commonality. These criteria can be grouped to Process-Oriented and Results-Oriented as mentioned in the Kaizen book . The Process-oriented criteria is a mirroring of the significance being given in effort by the Japanese culture except than outstanding results. Process-Oriented criteria can be attendance in meetings, willingness of participation, total number of problems solved and report submissions.

• Total Productive Maintenance.

TQM was introduced as a system before referring to the overall improvement of performance and quality. Now TPM stresses the importance of improving equipment quality. Simplified, is about ‘maximization of equipment efficiency through a total system of preventive maintenance spanning the lifetime of the equipment’. TQM includes everyone related to the company, however TPM correlates with people involved at the plant. A major continuous improvement activity affiliated with the system is the 5S which is analysed below.

1. Seiri (Sort): Distinguish between necessary and unnecessary items in the gemba and discard the latter. Start by removing all items from your work area. Inspect the equipment and identify those items that are critical to the success of the function performed at the workstation. Eliminate any duplicates, unnecessary equipment, infrequently used items, and trash. Identify the non-essential items as either waste or “valuable but not critical.” Store the non-critical items outside of the workstation area. This saves time, space, and labor costs, while enhancing productivity.

2. Seiton (Straighten): Arrange all items remaining after seiri in an orderly manner. Whatever equipment is deemed critical to the operation must now be organized. Assign positions for all equipment, work in progress, and raw materials, keeping ease of reach, identification, and proximity to work surface in mind as you do. The goal is to maximize the efficiency of the workstation layout. On a smaller scale, it’s the same concept as warehouse layout. The most frequently used tools should be the most convenient to grab. This eliminates wasted time from excess motion and searching.

3. Seiso (Scrub): Keep machines and working environments clean. Keep everything clean, every day. Doing this keeps things ready to be used when needed. A clean workspace is a productive workspace, and Seiso literally means “to clean or shine.” Clean the floors, the walls and the equipment, and ensure all items are restored to their designated place. Make sure the workstation is well lit. This should be a part of your daily tasks and should not be postponed until idle time is available.

4. Seiketsu (Systemize): Extend the concept of cleanliness to oneself, and continuously practice the preceding three steps. Make a habit of properly maintaining correct procedures to avoid backsliding. Implementing these steps is a continuous process. It is important to ensure that they are done each day to prevent slipping into old habits. Commit to performing these steps every shift and make sure that any changes to your product or process are compensated for at your workstation and problems are alleviated as quickly as they are created.

5. Shitsuke (Standardize): Build self -discipline and make a habit of engaging in 5S by establishing standards. Ensure conditions of work area do not return to the original, disorganized state. Make the previous three S’s part of your standard procedures each day. Implement them with the help of signs, banners, shadow boards, tool holders, etc. Make sure all workers understand their responsibilities and are empowered to perform all of the tasks.

Figure 5: The five steps of 5S

• Policy Peployemnt.

The process of 'hoshin kanri' in Japanese or Policy Deployment refers to setting a long-term strategy that breaks down to medium-term and annual strategies. The strategy should pass all levels of management until it reaches down to the shop floor or front-end. However, the strategy should include all the necessary actions or activities for the implementation of it as it cascades down to the lower levels of management. An example of policy deployment is setting a target of cutting costs by ten percent. The front-end or shop floor must acquire the activities that lead to reducing inventory, increasing productivity and improving the line configurations and essentially achieve the target.

• Small-Group Activities.

Kaizein in group work is executed via Small-Group Activities. Some examples of the activities are Zero Defects (ZD), Mini Think Tanks, Safety Groups, Productivity Commitees and the most popular one is the Quality Circles (QC). These activities present a nonconfrontatial and informal way of solving problems while proposing improvements . The groups are formed to tackle problems or carry out tasks in a workshop environment while using statistical tools such as histograms, pareto charts, cause and effect diagrams, run charts, scatter diagrams, flow charts and control charts. In addition, the PDCA cycle is executed, however, as not only the identification of problems but also the identification of root causes takes place there is another PDCA cycle implemented in the 'Do' of the first one. This defines the procedure as problem-solving and decision-making one.

Figure 6: PDCA inside PDCA

Moreover, in Japanese plants there is always a workplace situated for the execution of these activities. QC were invented in 1962 as studying groups firstly, having foremen and workers study together to get knowledge and techniques on quality control. Now, it possesses a more problem-solving structure.

Limitations

Commitement

Critically reflect on the tool/concept/theory and its application context. What can it do, what can it not do? Under what circumstances should it be used, and when not? How does it compare to the “status quo” of the standards – is it part of it, or does it extent them? Discuss your article in the context of key readings / resources provided in class. Substantiate your claims with literature

Annotated Bibliography

Imai, Masaaki - Kaizen (Ky’zen), the Key to Japan’s Competitive Success (1986).

The importance of this book is major as Masaaki Imai defines kaizen for the first time globally as a concept. That is done via merging the management philosophies, theories and tools that are implemented in Japan. Moreover, provides with theory, examples and application that is accessible to the western managers for the first time in order to apply kaizen to their working environment. More than one hundred examples and fifteen case studies are presented creating a concise interpretation of kaizen.

(Management for Professionals) Aristide van Aartsengel, Selahattin Kurtoglu - A Guide to Continuous Improvement (2013).

Presents Continuous Improvement as a necessity in today's environment in addition to providing with theory, definitions and applications for CI that distance from the traditional kaizen ones giving a more holistic view for CI.

Imai, Masaaki - Gemba kaizen, a common sense approach to a continuous improvement strategy (2012).

It is a continuation of the first kaizen book from Masaaki Imai. It provides with real world applications of continuous process improvements that adjust to the new market and implementation structures that changed after fifteen years since publishing the first edition book. Analyzes kaizen more in-depth while adapting the old systems into a new era in production and service businesses. Methods as 5S, visual management are introduced in addition to analyzing Taichi's Ohno waste management while transforming the original QCS (quality - cost - scheduling) principle from kaizen to QCD (quality - cost - delivery) principle in gemba kaizen.

Ronald D. Moen, Clifford L. Norman – Circling Back, clearing up myths about the Deming Cycle and seeing how it keeps evolving (2010).

It provides with concise information about the evolution of Deming's wheel and clarifies the difference between the PDSA and the PDCA cycle and other myths around it. Also, gives a historical overview about continuous improvement tools in a timely manner.