The questionnaire was completed by practitioners who have a wealth of knowledge related to PPP systems. The main contributors were law firms that have extensive experience advising clients on PPP transactions, laws, and regulations; public officials involved with PPP transactions; chambers of commerce, consultants, and academics familiar with PPPs; and private operators and other PPP experts.
Respondents were selected on the basis of their expertise with PPP transactions, as well as their willingness and availability to contribute. The following sources were used to identify the expert contributors:
> International guides identifying leading providers of legal services, including their specialization, in each economy. The guides include Chambers and Partners guides, the International Financial Law Review (IFLR), The Legal 500, Martindale-Hubbell, HG Lawyers' Global Directory, Who's Who Legal Directory, Lexadin, and country-specific legal directories.
> Large international law and accounting or consulting firms that have extensive global networks, whether through offices or local partner groups.
> Members of the American Bar Association, country bar associations, chambers of commerce, and other membership organizations.
> Government entities that undertake PPPs, such as ministries of finance, PPP units, and PPP procuring authorities.
> Professional service providers identified through embassy websites, business chambers, and other sources and recommended by World Bank Group staff.
Lawyers and professional services providers are in an ideal position to complete the survey and provide the most up-to-date information on the basis of their experience advising clients and working on PPP transactions. Involving PPP experts and practitioners from different sectors increases the accuracy of the data by normalizing potential biases held by different stakeholders. Furthermore, reaching out to both the public and the private sectors helps reveal the views and insights of the various stakeholders involved in the PPP procurement process.