The incidental expenses of a miscellaneous character which could not be predicted during preparation of the estimate, is called contingencies
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            Additional supervising staff engaged at work site, is called work charged establishment
                         
                    
                    
                                                                                
                            
                                
                            
                            
                                
                            
                            
                                
                            
                            Detailed specifications specify qualities, quantities and the proportions of materials to be used for a particular item