Pareto analysis in construction
Pareto analysis is a statistical decision-making technique that identifies a limited number of input factors as having a greater impact on outcomes, whether they are positive or negative. It is based on the Pareto Principle, popularly known as the ‘80/20 rule’, that stipulates that 80% of the outputs result from 20% of the inputs.
The principle was developed by Vilfredo Pareto, a 19th century Italian economist and sociologist who was researching wealth distribution. He subsequently discovered the 80/20 rule applied to areas outside of economics, for example, 80% of the peas in his garden were produced by only 20% of the peapods planted.
Pareto analysis can also be used as a project management tool. For example, the majority of problems (80%) are produced by relatively few causes (20%); and 80% of the project’s benefits are delivered through 20% of the work.
Put simply, Pareto analysis shows that a disproportionate improvement can be made by ranking the various causes of a problem and allocating resources to tackling those that have the largest impact.
In construction, there may be a problem with the project programme that is the result of a large number of causes. Through observation and the collection of data, it might be determined that there are 8 causes. Pareto analysis may show that 80% of the problems result from the top 2 or 3 causes. The project management team can then plan an appropriate response, targeting resources at those 2 or 3 causes, rather than all 8.
A Pareto diagram (or chart) can be used to present the analysis, helping the project team to focus on the inputs with the greatest impact.
Inputs are listed along the horizontal ‘y’ axis in descending order of output frequency (using the cumulative percentage of the outputs), and uses a line graph to chart them. The vertical ‘x’ axis measures the frequency of the output for each input, and uses a bar graph to chart them.
In the example diagram, it can be seen that 42% of the issues are related to installation, and that three of the categories; installation, software faults, and shipping, account for 79% of the issues.
[edit] Related articles on Designing Buildings
- Acceleration.
- Benchmarking.
- Contingency theory.
- Critical path method.
- Gantt chart.
- Key performance indicators.
- Line of balance (LOB).
- Milestones.
- Plan, Do, Check, Act (PDCA).
- Project crashing.
- Project manager.
- Project quality plan PQP.
- Quality in construction projects.
- Quality Management System.
- Resource leveling.
- Time-location chart.
- Time management.
- Value management.
- Work breakdown structure
[edit]
Featured articles and news
Heat pump announcements, what homeowners need to know
An 'ultimate guide to heat pumps' from a heating company.
Construction contract awards reach £7.1bn in February
Their highest level in seven months.
The journey to sustainability in heritage
Research is the key to better understanding.
Heritage approaches to adaptation, mitigation and loss.
Bridging the gap between policy, finance and installation.
Development on brownfield land
Definition, background, policy and the latest consultation.
With the Design Framework for Building Services.
Retrofit of Buildings, a CIOB Technical Publication
Pertinent technical issues, measures and the roles involved.
ECA joins HSE campaign to support mental health
Working Minds’ five simple steps based on risk assessment.
Mental health in the construction industry
Mental health issues in brief with related articles.
Transitional arrangements, Building Control and the BSR.
For pre-October buildings with substantial progress by April.
How to write an inspection and test plan
ITPs for quality control and assurance particular elements.
Why quality counts in domestic ventilation systems
From products, to systems to the installation.
Empowering the Future with CIOB Academy
Lifelong learning, upscaling, and reskilling for the built environment.
Winners of the 2024 ASBP Awards
Project, Product and Initiative according to the 6 pillars.