Lean Construction - Approach Capable of Dealing with Complexity and Uncertainty

Rupali Patel. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 6, Issue 11, ( Part -2) November 2016, pp.22-29
www.ijera.com 22 | P a g e
Lean Construction - Approach Capable of Dealing with
Complexity and Uncertainty
Vignesh. C
(P.G student, Construction Technology and Management, Manipal University Jaipur, Jaipur, India.)
ABSTRACT
The construction projects involve various risk factors which have various impacts on objective that may lead to
low productivity and time-overrun. One way of contributing to the productivity improvement is to implement
lean. Lean or lean thinking was implemented for the first time by the car manufacturer Toyota and has been used
in the manufacturing industry for decades. In the construction sector, lean have not been implemented as much
as in the manufacturing industry and therefore there is room to take lean further in construction projects. The aim
with lean in construction projects is to utilize the resources as labor and material better to get less waste, fewer
delays and lower costs or, in other words, to minimize the Non-Value adding Activities. The objectives of this
paper are to provide with fundamental knowledge and benefits of Lean Construction and its capability to
enhance performance in construction thus the quality of life for future Indian construction sector.
Keywords: Lean, Construction, Project, Management.
I. INTRODUCTION
Infrastructure sector is a key driver for the
Indian economy. Construction sector is highly
responsible for propelling India‟s overall
development and enjoys intense focus from
Government for initiating policies that would ensure
time-bound creation of world class infrastructure in
the country. India as a developing country faces
many complex difficulties in construction business,
such as inadequate details and documents of
preceding data concern risks and lack of adapting
modern techniques for minimizing the effect of risk
factors on projects objectives. One way of
contributing to improve performance and increase
productivity is to implement lean construction. Lean
concepts are implemented for the first time by the
car manufacturer Toyota and have been used in the
manufacturing industry for decades. In the Indian
construction industry, lean have not been
implemented as much as in the U.k, U.S.A, Sweden,
Denmark etc. and therefore, there is room to take
lean further in construction projects. Lean
construction sets productive flows in motion in order
to develop control systems with the aim of
continuous improvement to eliminate waste by
sorting out Value adding Activity (VA) and Non-
Value adding Activity(NVA) [1]. The objective of
Lean in construction is to utilize the value adding
resources as labour and material better to get less
waste, fewer delays and lower costs or, in other
words, to minimize the NVA. In general sources for
the NVA wastes in construction are Transportation,
Inventory, Motion Waiting, Overproduction, Over
processing and Defects. Elimination of these wastes
is achieved through the successful implementation of
lean elements [2]. The time spent on NVA varies
though, significantly among construction projects.
The average is that, just below 50% of the time in
construction projects are spent on non-essential or
wasteful activities as Non-Value adding Activity.
The waste of material in Dutch construction industry
is 09% by weight while the purchased material waste
in Brazil is 20-30%. Koskela discussed the waste,
VA and NVA in the construction by referring to
several studies. The cost for waste by poor quality is
between 5 % and 20 % of the total project cost while
the cost for bad material management is around 11
% of labour cost and excess material usage is around
10 %. From the reviews of the literatures, Lean
Construction is able to overcome the challenges
highlighted previously. Koskela et al argues that
Lean Construction is a system that will be able to
work with the complexity in the site and still be able
to minimize the wastage hence implement lean
construction is possible only with the collaboration
of the Owners (client), Architects, Engineers,
Contractors, Facility Managers, and End-users for
the project [3].The authors who researches in lean
suggested
• That lean production is able to reduce the
overall cost while maintaining the quality
standards and reducing cycle time.
• That lean construction is different from other
construction management due to its clear set of
objectives. It‟s aimed for the delivery process,
concurrent product design and process, and
production control throughout the life of the
project [4][5].
The foremost objective of this paper is to
provide a basis knowledge and understanding on
lean construction for Indian construction
RESEARCH ARTICLE OPEN ACCESS

stakeholders. An extensive literature review was
conducted in order to achieve the objectives of this
paper. This paper is also aimed at highlighting on
how to incorporate the LCM concept in the
construction industry to promote sustainable
construction.
Problem Description
Up until now, researcher‟s attention has
been paid in explaining lean as a philosophy of
management, with its principles and objectives.
Furthermore, it has been described the need to
reform project management and how lean can be
adapted from manufacturing to construction in order
to enhance current project management practices. It
is well known the increasing interest of companies in
new project management methods that allow them to
reduce duration, increase performance and avoid
confrontational relations during project execution
[5]. So far, lean project management practices are
relatively new and few authors have explained its
theoretical foundations as well as its convenience for
different types of projects according to their
complexity. On the contrary, researchers have
focused on decreasing uncertainty instead of trying
to deal with situations of uncertainty and
complexity. In addition, since construction projects
will continue to become more uncertain and
complex over time, a change in investigation needs
to be done. Thus, a study about lean construction
management together with project risk management
and its practices results necessary in order to enable
managers to assess project complexity. Then, when
the challenge presented by each project is
established, it will be possible to choose the best
approach to manage the project, traditional or lean
[6-8]. So, in a complex construction identifying a
optimum solution for any uncertain task is a high
priority to avoid delays and cost-overruns, hence
with-out the knowledge of lean construction,
identify an optimum solution for uncertain task
would be inadequate if the outlook is only limited to
traditional management.
Lean Production
Lean production beat mass production in
several ways. [10]. The time is cut, defects are
reduced, inventories and manufacturing space are
reduced and in lean production it is possible to
change from one product to another much faster than
in the mass production system. Products produced in
lean production process are replaced more frequently
and the variety of models is higher than in mass
production. Lean production, as a system with the
aim of producing more with higher quality and less
space, time, material and labor than the mass and
craft production systems. Which are archived by
using tools as just-in time deliveries, pull
mechanism, reduced batch size by reduced set-up
times and increased transparency where everybody
is involved in the production system. [10] [11] The
lean system that was developed in Toyota could be
seen as a pyramid with different levels of lean
implementation [12]. The pyramid with lean
principles, is presented in Fig. 1 below.
Fig 1 - Different stages of implementation of lean
[12]
Basically, lean construction is a big scale of
adaptation from the Japanese manufacturing
principles and the concept is implemented to the
construction process [13]. Cullen et al. stated that the
principles of lean construction, which arose from
adapting the concepts of lean production, had been
developed by leadership of Taiichi Ohno. Starting
from efforts to reduce machine set up time and
influenced by total quality management, he
developed a simple set of objectives for the design
of the production system, which is to produce a car
to the requirements of a specific customer, deliver it
instantly, and maintain no inventories or
intermediate stores [14] [15].
II. LEAN CONSTRUCTION
Despite lean was originally developed or
defined from the car manufacturing industry and
Toyota, Womack et al. argued that lean production
could be used with benefits in all industries. Such an
industry could be the construction industry. Lean
production is today used in several others industries
than the manufacturing industry, e.g. healthcare,
service and construction [16]. Lean in construction
projects has been promoted in countries as USA,
United Kingdom and Denmark while different kinds
of lean construction institute have been founded in
several countries, e.g. Lean Forum Bygg and Lean
Construction Institute. Lean in construction projects
has also been discussed and promoted in
professional press and among lean construction
networks, but not that much in articles and papers in
peer-reviewed journals [17]. Researchers as Koskela
have discussed lean in construction for over two

decades. Construction companies have discussed
implementation of lean the recent decade to create
competitive benefits of cost and time predictability,
quality, supply chain relationship and flexibility, and
also stronger relationship to the client. The
formulation lean construction got its name by Lauri
Koskela at a conference with a few researchers in
Finland 1993 [3] [18] [11].
Lean Construction has been introduced as a
new management approach to the construction
industry by Koskela and Howell. It is hoped the
successful adaptation of this concept will not only be
beneficial to the clients but also to the communities
and environment itself. There were barriers in their
implementing lean concepts in the construction
fields[19]. This point of view is affirmed by
Separate and Wijesiri, which stated that if a
company successfully implements the concept of
Lean Construction, it would be able to gain
significant cost advantage by eliminating cost-
consuming flow activities and become a cost leader.
[20] Furthermore, construction industries all over the
world such as Australia, Brazil, Denmark, Ecuador,
Finland, Peru, Singapore, United Kingdom, United
States of America and Venezuela have implemented
the lean concepts within the industry and have
earned its benefits [21]. Moreover, the Lean
Construction approach is different from the normal
practices as lean construction is based on production
management principles and it gained better results in
complex, uncertain and quick projects [22]. The
characteristics that could define complexity are
summarized and are presented below.
• Large number of elements where the interaction
is non-linear and dynamic, and the system
changes over time.
• The elements are different; the variability is
high and the relations among the elements vary.
• Unanticipated variability and uncertainty.
• The resilience of the system and the system‟s
ability to adjust the functioning to changes and
disturbance.
The characteristics are applicable to
construction projects and therefore construction
projects are complex systems. Saurin et al.
concluded that lean prescriptions are compatible
with complex systems and that lean helps to reduce
the unnecessary complexity [23]. The below
comparison can differentiate the processes between
lean and traditional construction process.
Lean construction
process
Traditional
construction process
Focus is on production
system.
Focus is on transaction
and contracts.
Transformation, flow
and value goals.
Transformation goal.
Downstream players are Decisions are made
involved in upstream
decisions.
sequentially by
specialists without
downstream players
input.
Product and process are
designed together.
Product design is
completed, then process
design begins
All product life cycle
stages are considered in
design.
Not all product life cycle
stages are considered in
design.
Activities are performed
at the last responsible
moment.
Activities are performed
as soon as possible.
Systematic efforts are
made to reduce supply-
chain lead times.
Separate organizations
link together through the
market and take what the
market offers.
Learning is incorporated
into project, firm and
supply chain
management.
Learning occurs
occasionally.
Stakeholder interests are
aligned.
Stakeholders interest are
not aligned.
Buffers are sized and
located to perform their
function of absorbing
system variability.
Buffers are sized and
located for local
optimization.
Table 1 - Summary between lean construction
processes and traditional construction processes [11]
Today‟s construction projects, particular
the larger ones, have a numerous sub-contractor.
Even though the negotiated price between the main
contractor and the client is fair and includes
opportunities for a qualitative work, the contract
between the main contractor and the subcontracted
entrepreneurs might be less fair. [24]. This lead to
the sub-contractors adjusts their own profits with a
high possibility low qualitative work instead of
contributing to the total value of the construction
process. Because of the complexity and uncertainty
in a construction process, it is important to have
responsibilities and relationships between the actors
that reduce the complexity and uncertainty, and
enable the possibility to deliver a lean project.
III. LEAN CONSTRUCTION PRINCIPLE
The traditional project management
practices treat all the activities in construction as
value adding activities (those which cannot be
removed) and accordingly the construction process
is a conversion based process in which one value
adding activity leads to another. Uncertainty in work
flow places great demand on communication
channels as people attempt to find some way to keep
the project or their crew moving in the face of
uncertainty. But flexibility defined in this way

requires slack resources and injects more uncertainty
into the flow of work. This states that as soon as one
activity is finished the other should start irrespective
of the fact whether the other pre-requisites of the
activity like materials, labor and equipment are
available. This model pressurizes the available
resources to act fast thereby resulting in a
compromise in the quality of the construction. On
the other hand, lean construction is a flow and
conversion based model where a construction
process is a collection of conversion processes
involving flows of information and materials from
one process to the other as depicted in managing and
improving the construction process to profitably
deliver what the customer needs [25].
Key Principles
Womack and Jones (2003) established five
key aspects in lean methodology that are necessary
to avoid waste. Lean thinking provides a method to
specify value, align the actions that create value
according to the optimal sequence, carry out these
activities without interruption when someone
requests them, and perform them with increasingly
effectiveness. Figure 2 shows the key principles of
lean management. [25].
Fig 2: Lean principles
• Specify value
Value in construction is like value in any
business: it is a return of investment. So, value needs
to be defined from the perspective of this client,
which meets the client's needs at a specific price at a
specific time. It is defined according to the end
consumer and is expressed in terms of a specific
product that meets customer‟s needs with a concrete
Specify Value Identify the value stream. In order to
achieve this, it is necessary to redefine the concept
of value in companies, the main objectives of
stakeholders and managers exceed the concept of
creating and specify value to the consumer or
client[25].
• Identify the value stream
The value stream is the set of all the
specific activities required to produce a specific
product. Value-stream mapping is a process of
identifying all the VA and NVA of any process. The
objective is to find a process to eliminate those
wasteful activities. At a top management level, it
offers a perspective on defining what is to be done
and how the systems are to be designed, supplied
and constructed, offers a different way of organizing
for construction. At a operational level, the value
stream map can identify where NVA of a particular
process is present. This process analysis shows how
value stream can be achieved more effectively. The
value stream is composed by all the necessary tasks
that should be completed in order to deliver the
product or service to the ultimate customer. Those
activities that do not add value are considered waste
and can be removed from the value stream.
However, it can be distinguished between activities
that are partially without value but needed in order
to complete the tasks and all the activities that do not
have any value and therefore should be eliminated
[25].
• Process flow
Flows are characterized by time, cost and
value. The flow of resources and information is the
most vital units of analysis in lean construction
management. It can be divided as controllable flows
and uncontrollable flows. Controllable flows are
effortlessly manageable aspects like materials from
the warehouse or instructions from management
respectively. Uncontrollable flows are complex to
manage and not dependable such as supplier's
provisions of resources and controlled design
information. Only after specifying value and
mapping the stream in relation to a process, value-
creating steps of flow can be devised. Hence under
lean thinking, improvement is possible by reducing
uncertainties in workflow which eliminate a
possibility time delays and cost-over runs.
Furthermore, it should be achieved a continuous
movement of the product through the value stream.
Doing this at the beginning of the project, will allow
to Release spaces, Discover the inventory excess,
Avoid and change an inefficient process, understand
that employees cannot be multifunctional [25].
• Pull
At operational level, pull identifies the need
to deliver the product to the client within a specified
time. The principle of pull suggests a decision where
the ability to define quickly what the client needs
from a building in relation to client business and
subsequently customizing and deliver them more
predictably when the client requires them. So, the
management avoids producing a irrelevant product
or service until the client downstream requests.
Applying the pull system in a construction
management implies to acquire the ability to design,

program and do exactly what the client requests.
This should be done at the time that the client orders
and with a reasonable cost. Project teams should
allow their customers to be involved in the design
process in order to extract value from them.by this
way, companies allow their clients to establish their
agendas and tell them what should be done [25].
• Perfection
A lean project requires constant vigilance to
maintain and improve its operation. It requires team
discipline and zero tolerance towards the waste of
resources. Many obstacles appear when trying to
achieve a lean environment. However, it is necessary
to get over them to permanently remove all the
waste of the value stream. With continuous
improvement done and with waste eliminated along
the flow process, perfection is the ultimate reward
that companies can achieve. In essence, lean
construction is a project delivery system founded on
the reliability and speedy delivery of value to the
client. it is important to remember lean is not a static
system and requires constant effort and vigilance to
perfect. Every employee should be involved in
implementing lean. Lean experts often say that a
process is not truly lean until it has been through
value-stream mapping at least half a dozen
times[25].
IV. APPLICATION CHANNELS OF LEAN
CONSTRUCTION
Though many applications tools have been
developed this study focus on the following two in
relevance to future work.
Lean Project Delivery System
Close related to the design-build delivery
method or design-bid-build with collaboration
project delivery method, is the lean project delivery
method. One of the key differences between a
project delivery adopting lean and project delivered
in a traditional way is the variation in phases [11].
Namely the definition of the phases as well as the
relation between them and the participants within the
phases. The different stages in a construction process
where lean is implemented, or as they call it, a lean
project delivery method. The main phases or
processes are the project‟s definition phase, design
phase, supply phase, assembly phase, and the usage
of the construction [11].
In the project‟s definition phase, the
importance is to take the client‟s and stakeholders‟
requirements into account, including involving the
representatives from the other phases to share their
knowledge to allow smoother further phases. The
design stage takes over the values, concepts and
design criteria from the project definition. The way
lean design differs from traditional is that lean
design tries to postpone the design as much possible,
i.e. last responsible moment, to have more time to
enveloping and exploring new alternatives and
solutions.
Fig.3 Different phases and their collaboration in a
lean project delivery system [11]
Traditionally the design tasks are made as soon as
possible which leads to reworks and disruptions
Next phase is the supply phase where the detailed
engineering, fabrication and delivery are included.
This phase prerequisites a product and process
system that are design to meet the requirements
about what has to be detailed and fabricated and also
when it has to be delivered to perform it in a lean
and efficient way. The next phase is the assembly
phase where the delivered products are constructed
and installed. The last is the usage phase where the
operations and maintenances take place and are
important for the life cycle perspective. In lean
delivery process illustrated in Figure 3 above, the
production control and work structuring are
important tools to support the process. [11].
Last Planner System
The last planner system (LPS) is a crucial
method of lean project management, which is
inspired by the lean production philosophy. The
elaboration of this system shows the adaptation of
lean principles and methods to the project area [26].
It consists of work flow control and production unit
control. Work flow control is accomplished
primarily through the look-ahead process, while
production unit control is accomplished primarily
through weekly work planning [27]. The LSP is
based on a traditional planning system, the condition
of (SHOULD-CAN-WILL-DID) is implemented.
Figs. 5A and 5B represented the diagram of the Last
Planner System. A reliable assignment, one that gets
done at the required time, determines what WILL be
done, after considering both what SHOULD from
higher-level schedules and what CAN be done based
on the situation at hand. Assignments are likely to
get done when they are well defined, resource sound,

in the right sequence, and within the capacity of the
crew. The last planner‟s job is to make certain task
in the assignment that meets these criteria and to
reject assignments that do not. Last planners can
reasonably commit to completing the tasks on
weekly work plans that meet these criteria. To be
effective, production management systems must tell
what should be done, what can be done, and what
will be done; then, they compare what was done to
improve planning [27].
Fig.4 Last Planner System. [27]
Fig. 4 illustrates the possible relationships
among SHOULD, CAN, and WILL. Referring to
Fig. 5A, a reliable assignment determines what
WILL be done, after considering what SHOULD
and CAN get done based on the situation at hand.
[27].
Fig.5 A-Philosophy of lean planning B-
Philosophy of traditional planning
In general Construction projects require
planning by different people, in different positions,
possibly at different organization and during
different moments of the life cycle of the work. The
LPS defines definite standards of obligation that are
requires advanced commitments of production in
order to protect the productive units from
uncertainty and variability. One of the founders of
lean construction UK, Mossman [28] explains about
five key conversations of the Last Planner System.
When all are working together they reinforce each
other and the overall benefits are greater. The
conversations are:
• Collaborative Programming
Creating and agreeing the production
sequence. This helps the project team get to know
each other, identify issues with the project and agree
how to resolve them and design and plan handovers
[27-28].
• Make Ready
Making tasks in the Look Ahead period
ready (i.e. constraint free). This ensures that the
work can be done when they want to do it[27-28].
• Production Planning
Collaboratively agreeing production tasks
for the next day or week. First Run Studies are an
opportunity to rehearse critical handovers and
understand where failures might occur so that they
can be planned to counteract [27-28].
• Production Management
Collaboratively monitoring production to
keep activities on track. Weekly or daily production
planning meetings lets team check for
interdependencies before they promise[27-28].
• Measurement, learning and continual
improvement
Learning together about and improving
project, planning and production processes. It helps
them adjust plans in the light of new information, &
the learning element encourages learning from
success & reduces repeated failures [27-28].The
reliability of the last planner system is measured in
terms of the percentage of planned completed (PPC)
as planned at the end of each week. The causes of
failures of fulfilment are identified and also
investigated each week in order to avoid them in the
future. The planning reliability is directly related to
productivity [26].
Kim and Ballard investigated the theories
implicit in two prevalent project control systems: (1)
Earned Value Method (EVM) and (2) Last Planner
System (LPS). They introduced two fundamental
and competing conceptualizations of management:
(1) Managing By Means (MBM) and (2) Managing
By Results (MBR) The EVM is found to be based on
MBR. However, project control based on MBR is
argued to be inappropriate for managing at the
operational level where tasks are highly
interdependent. The LPS is found to be based on the
MBM view. The empirical evidence from case study
suggested that the MBM view is more appropriate to
manage works when it is applied to the operation
level where each task is highly interdependent
[29].The LPS is not only a tool to replace or
compete with traditional practices as critical chain,
but it accompaniments and enhances them by

improving variability and workflows. In addition, it
tries to increase reliability of planning which in turns
increase the performance and productivity. The LPS
is specifically designed to enhance control in the
uncertainty and complexity. Fig 7 illustrates the
impact of implementation of the Last Planner
System on a construction project, it is evident that
Last planner system have a positive impact of the
system on budget and productivity [30]
Fig6.Productivity improvement using LPS [30]
V. CONCLUSION
Traditional project management, which
includes methods such as Critical Chain Project
Management, Critical Path and Program Evaluation
and Review Technique, has entailed several
problems, for complex projects, since it is not able to
deal with uncertainty, since managing uncertainty
and workflow in projects are crucial aspects in
construction, production management theories have
shown to be the best appropriate to reform project
management. They include the management of
activities, workflow between activities and the
creation of value. Of all the theories of production,
lean production is which best fits for construction
management, as it adds the value and flow view to
the transformation view in projects, in which
projects are only seen as the transformation of inputs
into outputs. With these new points of view,
constructions stakeholders try to deal with
uncertainty instead of avoid it, and to achieve the
best value form the customer perspective. These new
approaches give rise to the new project management
method, named lean Construction management,
which is organized by lean applications tools in
order to maximize value and minimize waste.
Despite all these achievements, traditional
project management has proved to be successful for
simple projects, where the problems that arise from
the interactions between activities can be resolved
without difficulty. Therefore, lean Construction is
appropriate for complex and uncertain projects,
where the management of the workflow and the
value perspective focused on customer‟s
specifications can allow managers to deal with
uncertainty. Thus, to decide which method should be
applied, it results necessary to evaluate the
uncertainty and risks of each project before their
beginning. In order to do that, Lean Construction
management appears as the perfect way to evaluate
risks and complexity in projects.
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