發送短信 : Do friends collaborate and perform better?: A pair program tracing and debugging eye-tracking experiment

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