Text this: A mathematical model used in flow lines for performance measurement and system improvement

 _    _     ______     _____     ___              
| |  | ||  /_   _//   / ___//   / _ \\    ____    
| |/\| ||   -| ||-    \___ \\  / //\ \\  |    \\  
|  /\  ||   _| ||_    /    // |  ___  || | [] ||  
|_// \_||  /_____//  /____//  |_||  |_|| |  __//  
`-`   `-`  `-----`  `-----`   `-`   `-`  |_|`-`   
                                         `-`