However, little progress in sustainable development can be expected until such pessimism is overcome. Such pessimism is manifested in overlooking the value of quantitative indicators like GDP/GNP as a means of economic estimation for the wealth of human beings. As argued by Pearce (1989) it should be noted that, despite their limitations, simple quantitative indicators have been very useful and powerful tools for comparison, and have been used by many nations and international organisations since the 1940s. Nobody guarantees the perfection of sustainability assessment models. The point is not to lose sight of the woods for the trees in trying to assess sustainability. One approach is to give the highest priority to discussing operational issues—practical applications of the concept of sustainable development. Thus, in considering sustainability assessment, the monitoring of the shift in people’s quality of life and the natural environment over a selected time period( weak sustainability) rather than pursuing the idea of the indefinite continuation of a situation (strong sustainability) may be desirable. An approach in sustainability assessment is ‘to bring sustainability closer to becoming an operational guide for designing a better future’ (Khosla, 1995, p. 9). The key is to develop a protocol for assessing sustainability and to follow it consistently to ensure a comprehensive, careful, and deliberate decision-making process (Munro, 1995).