In the United Kingdom, the Business Optimism Index is published by the Confederation of British Industry's in its Industrial Trends Survey. An average of 400 small, medium and large companies from the manufacturing sector is surveyed each quarter. The Questionnaire accesses the overall sentiment regarding general and export business situation, investment, capacity, order books, employment, output, stocks, prices competitiveness regarding domestic, EU and non-EU markets and innovation and training. For each assessment is computed a sub-index as the percentage of positive answers minus the percentage of negative answers. The composite index is then computed as the weighted average of the sub-indices. An Optimism Index of +100 indicates that all survey respondents are much more confident about future prospects, while -100 suggests that all survey respondents are much less confident about future prospects. An index level of 0 indicates neutrality.