the subperiods corresponding to the stage of preparation of a destruction site or sites and to each of the destruction stages. As regards balancing the process of destruction, a new stage will begin only when all the countries have satisfied the requirements of the preceding stage. It also seems necessary to have, at the beginning and at the end of the destruction process, two rather long stages which should serve to absorb any delays that might occur because of unforeseeable technical or industrial incidents. The first stage, in particular, is very important since, during it, the means and all the systems of security, verification, etc. will be put in place and tested. This first stage, which will affect the "industrialization" of destruction (or conversion) should be rather long - two years seem a reasonable period. We will therefore have a time-table which would be as follows: Preparation and construction of the destruction site or sites , security systems, qualification of the site and systems with possible improvements, beginning of destruction. Time necessary = two years . First stage of destruction See section 3 above, order: 1(a), 1(b) and 2(a), 2(b), 3(1) and part of 5(a). Time necessary = three years . Second stage of destruction See section 3 above, order: conclusion of 2(a), 2(b) and 3(1), a large part of 3(a) and possibly the remainder of 3(b). Time necessary = three years . Third stage See section 3 above, order; conclusion of 3(a). Time necessary = two years . It is understood, of course, that this theoretical time-table cannot be followed literally. Countries which do not possess lethal toxic chemicals in their arsenal must begin the destruction of its stocks at the same time as the other countries. 5. Verification
**Analysis**
The text appears to be discussing a process of destruction of toxic chemicals, involving multiple stages, preparation, and verification. The focus is on the logistics and timing of the destruction process, rather than the chemical properties or environmental impact of the chemicals. The text also mentions "industrialization" and "conversion" which suggests that the destruction process is being viewed as a complex industrial operation.

**Category**
Industry, Science and technology