Statute 20 Industrial procurement 19 Business logistics 18 History 14 Materials management 14 Psychology 12 Management 11 Prolog (Computer program language) 10 Voyages and travels 10 Artificial intelligence 9 Physical distribution of goods 7 Travel 7 Industrial procurement--Management 6 Law and legislation 6 Marketing channels 6 Agricultural Economics 5 Customer services 5 Purchasing 5 Supply chain management 5 Counseling 4 Delivery of goods 4 Democracy 4 Digital media 4 Economics 4 Foreign trade regulation 4 Inventory control 4 Knowledge representation (Information theory) 4 LISP (Computer program language) 4 Marketing 4 Problem solving 4