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1. Unforeseen site conditions
2. Design aspects
3. External stakeholders influence
It all depends on the project type, location, size and circumstances. Some of the risks we've faced:
1- Excessive De-Watering.
2- Unforseen soil conditions when doing piling.
3- Estimation Errors.
4- Weather Conditions.
1. Customer uncertainties causing changes in scope;
2. Errors in executive projects;
3. Weather conditions;
1. Changes in the work
2. Technical conditions
All comments above are very valuable inputs depending on their project situations. I just roughly list some categories of risks for construction domain based on my experience in various international civil projects for over 15 years. All listed below might be dependent on the real situations and durations in different projects since longer period will impose much more uncertainties in planning and executing the project.
1. Performing Organization
1.2. Culture, communication and management engagement
1.3. Supporting departments
2.1. Client Organization
2.1.1. Duplicated roles or responsibilities or vague communication channels
2.1.2. Biased decisions in conflict of interests.
2.1.3. Lack of expertise
2.2. Client Representative
2.2.1. Biased decisions
2.2.2. Lack of power
2.2.3. Lack of expertise
Unclear design issues might create huge uncertainty impacts.
4. Site Condition
Unforeseen site conditions might be compensated though claim procedures but may not all.
Type of contract, unclear and/or arguable stipulations, procedures on unclear design and unforeseen site conditions etc. So many contract issues might affect the overall performance of project.
Schedule risks might be dependent on the experiences and technical skills of estimators and team members.
Cost risks might be largely dependent on the experiences and technical skills of estimators and team members.
8. Project manager's leadership and technical skills
9. Weather condition
10. Force Majeure
11. Sellers or subcontractors
12. Applicable law or regulations
13. Environmental and safety effects
14. Workers' health effects
16. Regional cultures or practices( for International projects)
17. External stakeholders like relevant authorities and residents
18. Site acquisitions
19.Lack of historical information
20. Labor union.
In three important, that I have see also
Estimation error is almost not a risk, in the sense that it's a certitude, the magnitude is unknown.
Weather conditions, I guest you mean changing weather condition from historical data. Like we plan for something in the 1 by 10 years base on historic data, but the new 1 in 10 is closer to the 1 in 50.
Customer is always a risk in any industry, specially your first project with a new customer.
Error in execution, do you mean from error in the engineering or error by the trade workers?
What do you mean by "Changes in the work", by the client or by the constrain on site or error in the design?
Accident is an important one, all the Heart and safety issue can have a major impact on a project. Some accident can close the site for a day or more depending on gravity.
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