By Karthikeyan Lakshminarayanan
Abstract
Lean Thinking is widely accepted as a philosophy and technique for eliminating waste from processes and thereby delivering exactly what the customer wants, as quickly as possible. The "value and waste" perspective is created through a value stream mapping exercise, predominantly focused on quicker value generation through waste elimination. There is, however, evidence that scope expansion that would enhance value stream mapping such that the focus on value enhancement is increased. In this context, there are several techniques associated with TRIZ that can be beneficial. Function-based thinking and Ideality can help in creating an improved understanding of value (and thereby waste). Nine Windows can broaden the context and scope of value stream mapping to provide an end-to-end perspective. The Little People concept can be used for micro-level problem identification and solution creation. There is considerable energy in the Six Thinking Hats technique for brainstorming, idea generation and solution evaluation that can be channeled into value-oriented thinking. This paper attempts to combine the strengths of various techniques into a Holistic Value Framework suitable for process analysis, optimization and alignment of processes to their end-objectives.
Background
Applicability of TRIZ concepts to Lean Thinking is hardly a new development. Several authors have delved into this subject earlier. Brian Campbell, in his article Lean TRIZ has suggested different ways in which TRIZ concepts can be used in Lean Thinking. Sergei Ikovenko and Jim Bradley, in their paper TRIZ as a Lean Thinking Tool, discuss the applicability of TRIZ Plus to basic Lean principles, including value definition, types of waste and value stream mapping. Amanda Bligh, in her paper The Overlap Between TRIZ and Lean, touches on how concepts like Nine Windows, Little People, ideality and the core problem solving capabilities of TRIZ can be used within conventional Lean Thinking. Michael Slocum, in his article, Leaning on TRIZ, demonstrates the need to use TRIZ to create solutions for eliminating non-value added operations that prove difficult to get rid of
From a Lean perspective, James P. Womack and Daniel T. Jones have incorporated aspects of a value-focused approach in their articulation of value and value stream in Lean Thinking. Tyson Browning has interestingly compared Lean with "getting in shape," mapping waste elimination to weight reduction or liposuction and value enhancement to diet and exercise in his paper On Customer Value and Improvement in Product Development Processes.
| Figure 1: Holistic Value Framework |
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This paper builds on some of these ideas and thoughts further to develop a Holistic Value Framework that incorporates diverse elements like ideality, function-based thinking, Nine Windows, Little People from TRIZ and Six Thinking Hats from deBono's work into traditional Lean articulation of value and value stream. The focus of this framework is to encourage the wearing of a value-focused lens rather than a waste-focused lens to differentiate between value and waste.
Value Stream Mapping – A Traditional View
From Wikipedia.com: "Value stre
Traditional Value Stream Mapping 1. Define value.
2. Go see yourself.
3. Map the end-to-end as-is process.
4. Note the cycle times of activities.
5. Map the information flow among actors in the process.
6. Identify the value stream – process steps that add value and information flows that supplement the addition of value.
7. Note the value-added time for each activity.
8. Identify wastes.
9. Eliminate wastes. |
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am mapping is a paper and pencil tool that helps you to see and understand the flow of material and information as a product or service makes its way through the value stream. A value stream map (AKA end-to-end system map) takes into account not only the activity of the product, but the management and information systems that support the basic process. This is especially helpful when working to reduce cycle time, because you gain insight into the decision making flow in addition to the process flow. It is actually a Lean tool. The basic idea is to first map your process, then above it map the information flow that enables the process to occur."Mapping the process starts with plotting the as-is process. The key is to become one with the process – to become one with the object that is actually traversing the process (while carrying a magnifying glass). Some fields of thought suggest splitting this first step into three – value definition, plot the value stream backwards (from final value or output to the first input) and then employ a go-see-yourself strategy from start to end to see the exact happenings in the process. One could do the go-see-yourself part first and the value stream next – something that's best left to individual choice. It is important to note that these steps are different (they have different objectives) and necessary. Also, it is not of paramount importance in the traditional value stream mapping sense, to map the value from end to start or in reverse. It seems to work perfectly fine even in the forward direction.
The next step (that can also be performed independently) is to map the information flow. The information flow captures data flow among actors in a process as well as the flow of decisions that support the generation of value at every step.
Once the as-is process is up on the board, we need to examine each activity in the process critically from the perspective of value-addition to the end-product. Activities can be classified into three types [Womack and Jones, Lean Thinking]:
- Activities that unambiguously add value
- Activities that do not add value but are unavoidable
- Activities that do not add value and are immediately avoidable
Types of Waste in Lean 1. Over-production
2. Waiting
3. Transportation
4. Motion
5. Inventory
6. Over-processing
7. Defects
8. Unused intellect |
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Once this is done, we can look at the target cost or entitlement. Typically suitable for transaction processing chains, entitlement of a process is the minimum cycle time in which the output can be generated. Overall entitlement typically is the sum of entitlements of individual activities. For each activity, we note C/T (cycle time) and V/T (value-added time) with a view to identify the chunks of waste within activities – parts of activities that do not contribute to the overall value. We also note the total number of steps in the overall process. To help identify waste, eight different waste categories have been defined; these are triggers to think about and identify as many wastes and as much waste as possible. For example, consider a person wanting to get home and plonk himself on his favorite sofa at the end of a hectic work day. (Assume that he has already driven to the gate of his house.) In a traditional value stream mapping, each of the activities leading up to the person sitting on the sofa is listed or drawn, and cycle times and value-added times for each of the activities are noted [Table 1].
The next step is to identify wastes – wait times, over-processing, unnecessary motion, etc.
| Table 1: Value Stream Mapping Output |
| | Activity | C/T (s) | V/T (s) | Waste | Solution to Eliminate Waste | 1 | Park car outside gate | 60 | 20 | Waiting | | 2 | Get out of the car | 10 | 10 | | | 3 | Open Gate | 10 | 10 | | | 4 | Re-enter car | 20 | 20 | Unnecessary motion | Eliminate re-enter car by opening gate and garage door in sequence | 5 | Drive to garage | 15 | 15 | | | 6 | Get out of the car | 10 | 10 | Unnecessary motion | Eliminate | 7 | Open garage door | 60 | 60 | | | 8 | Re-enter car | 20 | 10 | Unnecessary motion | Eliminate | 9 | Park car in garage | 120 | 60 | Unnecessary motion | Add grid lines for parking guidance | 10 | Close garage door | 30 | 30 | | | 11 | Close gate | 30 | 30 | | | 12 | Walk to front door | 30 | 20 | | Run to the front door | 13 | Dust shoes on the door mat | 10 | 5 | Over-processing | Two strokes are sufficient, the third stroke doesn’t result in any additional dirt coming off | 14 | Unlock door | 5 | 5 | | | 15 | Turn on the lights | 5 | 5 | | | 16 | Sit on the sofa | | | | | | | 435 | 310 | | |
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It is interesting to note that much of the traditional value stream activity focuses only on waste elimination. Once all waste is eliminated, value-added time equals entitlement and process efficiency equals 100 percent.
The key here is to draw the line between waste and value. It is likely that many of the activities are not adding directly to the final value but are necessary from a process standpoint. "I want to get into my house, but I can't do it without parking my car!" This could be termed as "psychological inertia" of the activity – the person is so used to doing the activities that the activities look like value-added activities. At the same time, because of the focus on waste, the end-process usually results in an optimized version of the initial-process, with some activities eliminated and a few curtailed or modified. Quantum leaps are difficult to achieve with this kind of analysis. This is where some other techniques like function-based thinking, ideality and TRIZ can add value to the value stream mapping process.
Activity-Function Mapping
From a function perspective [Mann D, Hands-on Systematic Innovation], activities are essentially ways to perform specific functions – and the sum of these functions produces the final output or value. Therefore, rather than looking at the process from an activity lens, function thinking encourages us to look at the motive behind the activities: each activity performs one or more functions and each function is essential to create the final product or value or output. Applied to value stream mapping, once the as-is process is determined, one can abstract to one layer higher and think about the association of each activity with a specific function (or more than one function) and the inputs and outputs to each function.
In the prior example, one could possibly map activities to functions in the following manner [Table 2]:
| Table 2: Activity-Function Mapping |
| Activity | Function | Park car outside gate | To get out | Get out | To open gate | Open gate | To park car inside | Re-enter car | To park car inside | Drive to garage | To park car inside | Open garage door | To park car inside | Park car in garage | So that it is safe | Close garage door | No-one else should get in and tamper | Close gate | No-one should get in/trespass | Walk to front door | To open door | Dust shoes on the door mat | House shouldn’t get dirty | Unlock door | To get in | Switch on the lights | To be able to see |
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Once the functions are identified, multiple options can be devised to carry out those functions [Figure 2]. As long as the function is met, activities don't matter. Alternatively, one can choose from multiple options for the optimal way to perform a specific function or a string of functions.
| Figure 2: Option Generation Through Function-based Thinking |
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With so much hinging on the subjective evaluation of what constitutes value and waste, the ability to be clearly able to do so is critical to the utility of value stream mapping to process improvement. The waste elimination mindset tends to be restrictive and offers very few clues or options. A function-based approach can trigger the generation of many more options and facilitate the creation of a holistic value stream map. Also, a detailed function model can be used [M. S. Slocum, Leaning on TRIZ, S. Ikovenko, J. Bradley, TRIZ as a Lean Thinking Tool] to analyze cause/effects, identify wastes and unused resources and apply TRIZ inventive principles to resolve contradictions.
How to generate options is another topic of great interest. Once again, we can get a lot of help from Six Thinking Hats, ideality-based thinking and TRIZ. Nine Windows can be an excellent tool to detail functions and problems. However, even for those uninitiated in the ways of TRIZ, the following four questions (and the answers to those questions) can help in the generation of options [Figure 3].
1. What? "And then what else?"
What function is being performed? In essence, what is the value being added? What are the current activities that perform the function? What other functions do the activities perform? Are there other ways to achieve the same function?
2. Who? "And then who else?"
Who is performing the activities? Who is involved in delivering a specific function? Are they the right people? Who else could do it?
3. When? "And then when else?"
When are the activities performed? When is the right time to perform a specific activity or function? Are there other times when the activity could be performed?
4. Why? Why? Why? Why? Why?
| Figure 3: Value Stream Mapping – A Template for a Function-based Approach |
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In essence, the function view focuses on value rather than waste. This is the main difference between a traditional value stream perspective and a function-based approach. There is space for the application of both approaches – first, a function-based approach to get a value-aligned process and second, the waste-elimination mindset to optimize the new process. Function analysis can be a new step preceding the traditional value stream mapping and waste elimination steps. It can add considerable value to overall process improvement and can produce a better alignment with the final value.
Nine Windows (or the System Approach)
There is considerable literature on the effectiveness of Nine Windows [D. Mann, Hands-on Systematic Innovation] in stretching the problem landscape [Table 3]. In fact, Nine Windows can be a very effective way of depicting value streams in transactional processes.
| Earlier super-system (the big picture where value is generated) | Super-system of value (generalized view of value) | Future super-systems (the big picture where value is used) | Earlier system (steps leading to generation of value) | Value/output | Future (How does the customer use the value?) | Earlier subsystems (the “nitty-gritty” of specific activities) | Subsystems of value (the components of output) | Future subsystems (the “nitty-gritty” of value usage) |
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It is likely that the traditional value stream would fall in the "earlier system and current value/output" cells above – activities that are performed leading to the final output/value. Owing to the focus on detail during as-is process mapping, the traditional value stream mapping process is also likely to inadvertently include some of the subsystem level information. (There might still be value in deliberately thinking from a subsystem perspective).
Nine Windows can add considerable value to this picture by expanding the scope of thinking to the future [Table 4]. This is where the output/value is likely to be used by users and this usage would again fit into a super-context and is likely to have several sub-contexts. Understanding these blocks can add to the understanding of customer value and thereby assist us with developing the optimum processes in place to generate that value [A. Bligh, The Overlap Between TRIZ and Lean].
Consider the manufacturing of suitcases. The traditional value stream can be used to note all activities leading to the creation of a suitcase through the manufacturing and assembly of various components. Once manufactured, the suitcase is transported to wholesalers and retailers, purchased by customers and then used in varied environments. Working out these future value streams can provide useful inputs to value creation as well as optimization. More interestingly, this sort of holistic thinking can help generate ideas for modified products or new product lines.
| Table 5: Nine Windows – Windows to Explore |
| General manufacturing methods, bulk manufacturing, factories, raw material procurement and processing etc. | General purpose mechanism to carry objects (like rucksacks, bags, suitcases, briefcases, vehicles like cars, trucks etc.) | Business trips, leisure trips, hotels, airports, vehicles, backpacking, living off suitcases for frequent travelers, travel needs, climatic conditions | Manufacture and stress test | Suitcase | Carried by hand, on road, escalators, can contain clothes, shoes, solid objects, liquids, wet and dry items | Specific manufacturing of components like bodies, handles, locks, steel frames, cloth, resin, coloring techniques etc. | Body, handle, lock, support, wheels etc. | Solid body, flexible but strong material, soft handles, strong straps, silent wheels |
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For example, suitcases need to have strong exteriors to withstand pressure and force when being transported in cargo compartments and conveyor belts. At the same time, it would be nice for them to be lighter and flexible when being carried by hand or in personal transport. "From a TRIZ perspective, this would be a nice physical contradiction to resolve." Gazing at the future can help the practitioner question status quo in terms of whether customer value is actually being met by the current process. It can also help in process optimization by crystallizing waste more clearly. For example, if the primary objective of medium-sized rucksacks is to enable frequent, quick, lightweight traveling, providing wheels on rucksacks doesn't make sense (added comfort may not compensate for added weight). Depending on future usage patterns, stress testing can be optimized to focus on parts prone to stress like handles, straps and locks.
The traditional articulation of value stream mapping tends to restrict the scope of their application somewhat. Nine Windows can facilitate the creation of a more complete and holistic value stream map which integrates a broader spectrum of views – general and specific, past, present and future.
Little People
Altshuller's "Little People" (also called "smart little people" or "mighty miniature dwarfs") [D. Mann, Hands-on Systematic Innovation] concept is a simple but powerful way to understand a process from within the process rather than from outside. This ties in very closely with "go-see-yourself" and "become-the-product" from Lean. It is quite easy to mix or equate the two in the traditional value stream mapping activities. There is, however, a subtle difference between the two. "Go-see-yourself" is the magnifying glass; but the view is essentially external to the process. "Become-the-product" is a way to view the process from within. By identifying this difference and by associating "become-the-product" with "Little People," the practitioner is encouraged to look at the process from within and to also "feel" for the product. In a way, this combination of "look and feel" is instrumental in generating interesting internal views, problem identification at microscopic levels and generating ideas to solve micro-problems.
Micro-level Problems and Solutions 1. Go-see-yourself
The magnifying glass to view the process from outside the process. 2. Little People
View the process from inside the process. |
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For instance, in a cargo transport scenario, if one were to become the suitcase (that gets transported from home to the airport via car, and from there to the baggage line, get stamped on, tied, marked, thrown about, collide with other suitcases in the same line and in the cargo deck, get squeezed between some bullies, lose some limbs and get dirty in the process) it would be much easier to come up with processes that handle suitcases better, keep them (and their contents) safe and secure (e.g., suitcase conveyor belts that are used today). Considering that suitcase handles are most vulnerable to breaking off, Little People sitting on the handle will testify that a huge suitcase crashes into the handle on which they were sitting, and the handle mostly breaks off at one of the hinges due 
