Lean construction is a “way to design production systems to minimize waste of materials, time, and effort in order to generate the maximum possible amount of value,” (Koskela et al. 2002). Designing a production system to achieve the stated ends is only possible through the collaboration of all project participants (Owner, A/E, Contractors, Facility Managers, End-user) at early stages of the project. Lean construction supplements traditional construction management approaches with (Abdelhamid 2007): (1) two critical and necessary dimensions for successful capital project delivery by requiring the deliberate consideration of material and information flow and value generation in a production system; and (2) different project and production management (planning-execution-control) paradigms.
Prior to a successful Lean implementation, a lean assessment should be conducted to identify gaps in knowledge that need to be addressed. The lean implementation assessment consists of all the observed categories of lean implementation. The assessment is based on a scale that ranges from 0 to 4, where 0 represents the state of Uncertainty and 4 represents the Challenging state. The table below identifies the maturity levels used for lean construction assessments (Nesensohn et al., 2014).
Using a Project Management Information System (PMIS) like PMWeb, a form will be created to perform the Construction Lean Assessment and improve your organization’s lean construction awareness. The form will include the 10 categories and 20 questions for the Lean Construction assessment. It is assumed that all assessment questions have the same importance weight of 5%. For each assessment question, there will be a pre-defined maturity score value of 5 points (0, 1, 2, 3 and 4).
For one of the performed assessments, the Construction Lean Assessment form was used by the two groups assigned to perform the self-assessment for which each had 10 team members. Those members would usually have a basic understanding of the definition of Lean Construction have a basic knowledge regarding Lean Construction principles. For example, on this performed assessment, the first group from the head office included: the CEO, project management office (PMO) director, CEO office manager, senior planning engineer, senior cost engineer, head of civil department, head of electrical department, technical manager, procurement manager, and human resources (HR) manager. The second group of workers involved in the action research consisted of the project manager, construction manager, civil superintendent, mechanical superintendent, electrical superintendent, telecommunications superintendent, quality manager, safety manager, quantity surveyor, and planning manager.
The attachment tab of the Construction Lean Assessment form will be used to upload and attach all supportive documents used in the assessment. Those documents will be stored in the PMWeb document management repository under the specific folder of Lean Construction Assessment.
The assessment workflow tab will be used to capture the details and comments made by those involved in the lean construction assessment process. In this case, there were twenty assessors for the two groups. In addition, should there be the requirement to have different assessors to perform the assessment for the different ten categories, then the PMWeb custom form will separate each category or group of categories to be done by assessor in different tables. This will allow setting the access rights to those tables to match the workflow roles.
The Lean Construction Assessment output form is based on the overall score of the ten categories of the assessment as per the assessment performed by each assessor from within each group. The results are considered to be the company’s level of Lean Construction awareness; this is represented as a score between 20 and 100. There are five Lean Construction maturity levels. Those are initiating, planning, execution, monitoring and controlling, and closing.
The Construction Lean Assessment Report will consolidate the assessment results performed by the two groups as detailed earlier. This will enhance the understanding of current strengths and weaknesses underlying the areas covered by the assessment. The report will provide the assessment details of each assessor, total score per category and the average score for each group as well as average total score.