The PMI measures changes in activity in Swedish industry based on monthly surveys carried out among 200 purchasing managers in the manufacturing industry. It is the weighted average of five different subindices regarding the conditions in purchase; production (25%), order books (30%), stock of purchases (10%), delivery time (15%) and workforce (20%). A reading in excess of 50 indicates positive sentiment among a majority of respondent companies, while a figure below 50 points to negative expectations.