compare expenditures on research and development. The United Nations International Comparison Project has, in its reports, not even addressed the problems of comparing research and development expenditures. Thus, when the Group started to prepare for international comparisons of military research and development, it was indeed on virgin land. 92. The first option that the Group considered was whether it could be possible to compare and evaluate outputs of research and development. The Group therefore discussed the possibility of reauestinq cost estimates for a number of well defined research and development projects. It came to the conclusion, however, that Clear specifications of such projects would probably be very difficult to achieve. It was therefore considered that there would be a great risk that they might be misinterpreted by the contacts. The Group also noted that military research and development is often very specialized in view of which it seemed less appropriate to work on the basis of pricing a number of standard projects. The Group therefore decided to adopt another approach. 93. This approach pertained to the collection of data for a relevant sample of such items that constitute inputs into the process of military research and development. As those factors were not sufficiently known to the Group when it started to deal with these questions, it decided to construct a questionnaire for the purpose of collecting such information that would enable the Group to proceed to the selection of an appropriate sample of inputs at some later stage. 94. This first questionnaire, which is attached to the present report as appendix IV, merely requested information on certain kinds of distribution of the research and development expenditures of participating countries and some questions concerning the availability of price indexes for military and civilian research and development. 
**Analysis**
The text appears to be discussing the challenges and methods used to compare expenditures on research and development, particularly in the context of military research and development. It seems to be focused on the process of collecting and analyzing data on inputs and expenditures, rather than the outputs or outcomes of research and development. This suggests that the category that best fits this text is one that is related to the collection and analysis of data on economic activities.

**Category**
Science and technology, Industry