 
                            
                        
                        
                        
                                        
                                        attain targets while satisfying constraints 
Simon (1997, p. 17); As cited in: Gustavo Barros (2010, p. 460). 
1980s and later
                                    
Source: 1970s, On purposeful systems., 1972, p. 145, as cited in: Galjaard (2009, p. 89): About the information-concept of Ackoff.
                                        
                                        attain targets while satisfying constraints 
Simon (1997, p. 17); As cited in: Gustavo Barros (2010, p. 460). 
1980s and later
                                    
Source: 1970s-1980s, The Economics of Information (1984), p. 55
Source: Our Modern Idol: Mathematical Science (1984), p. 42.
Source: "Relevance of laboratory experiments to testing resource allocation theory," 1980, p. 346.
 
                            
                        
                        
                         
                            
                        
                        
                        