There are many similarities and differences between national and global project management. A project manager must realize that what might work in their home country may not work in a foreign environment. Project managers may find themselves using practices that have worked for them in the past, without even thinking about the new environment, and problems may arise. Project managers must understand the differences in a different country's environment to avoid and reduce any obstacles that may exist. Some considerations that global project managers must consider are the legal, political, security, geographic, economic, and cultural implications of working with different countries (Gray, 2006). Some legal and policy issues that project managers should consider are complying with the laws and regulations of the country in which they are seeking to work. The foreign environment usually protects local workers and can strongly influence how different types of projects can be implemented. Additionally, safety is a high-risk factor and must be taken into consideration when going to a foreign country. The geography of a country is also a consideration. It is necessary in this case to evaluate what the weather will be like, for example; it rains often or it is very hot. These considerations need to be made and planned for in the overall projects, as some of these challenges could cause project delays if you are working on a construction project. Additionally, economic infrastructure must be considered. It is important to find out how the foreign country conducts business and how it might influence the success or failure of the project. Infrastructure is important, as the project manager should know whether the services needed for the projects, such as communication, are available. It is important to evaluate whether the project manager must speak the foreign language fluently. Additionally, you may need to know whether resources will be available to assist in the communication process. (Gray, 2006) Most developed nations use the same project management techniques, including; CPM, risk analysis, trade-off analysis (Gray, 2006). The customs, values ​​and philosophies of the foreign country must be respected by the group operating in your area. Many projects have gone wrong when project team members did not recognize or respect the values ​​of the foreign country involved in the project. Project managers working in a global environment must recognize the various ethnic and sociopolitical challenges involved.