In a computer system, a method of automatically extracting quantity information from a construction drawing for an order for construction material, said construction drawing containing a plan layout marking a type and location of structural elements in readable text, and a table listing the structural elements and the structural elements' corresponding specification in readable text, said method comprising:
- opening said construction drawing and selecting said table in said construction drawing;
- searching said table based on a pre-determined set of guidelines and reading the text corresponding to said structural elements and structural elements' corresponding specification;
- interpreting the text based on a pre-determined set of rules to calculate quantity information for said structural elements;
- selecting said plan layout in said construction drawing;
- searching said plan layout and reading the text marking said structural elements;
- and
- calculating the quantity information for the order using said quantity information and said text marking said structural elements.