Text this: Economic design of exponential chart for monitoring time-between-event data under random process shift

  _____     ______   _    _    __   __    _____   
 / ____||  /_   _// | |  | ||  \ \\/ //  |__  //  
/ //---`'   -| ||-  | |/\| ||   \ ` //     / //   
\ \\___     _| ||_  |  /\  ||    | ||     / //__  
 \_____||  /_____// |_// \_||    |_||    /_____|| 
  `----`   `-----`  `-`   `-`    `-`'    `-----`