{
    "measure" : "progress",
    "thresholds" : [0.1, 0.3, 0.5],
    "min_lesson_length": 100,
    "signal_smoothing" : true, 
    "parameters" : 
    {
        "small_wall_height" : [1.5, 2.0, 2.5, 4.0]
    }
}