fourthly , our definition mention the possibility of ,but dose not insist upon , "quantification' of issues. We regards it as begin less important that a problem, opportunity , or trend can be measured than that an attempt should be made t o understand and explain it , in terms of what we have called its 'likely causes, components. and consequences', Later in this chapter. we shall develop the reference to the 'components' of an issue under the heading or 'disaggregation' ( 7.5.7 ).