The assumptions upon which any profit forecast appearing in a listing document are based must provide useful information to investors to help them in forming a view as to the reasonableness and reliability of the forecast. Such assumptions should draw the investors' attention to, and where possible quantify, those uncertain factors which could materially disturb the ultimate achievement of the forecast. The assumptions should be specific rather than general, definite rather than vague. All embracing assumptions and those relating to the general accuracy of the estimates made in the profit forecast should be avoided. Furthermore it will not normally be acceptable for assumptions to relate to matters which the directors, by virtue of their particular knowledge and experience in the business, are best able to take a view on or are able to exercise control over since such matters should be reflected directly in the profit forecast itself.