function assessMelodicMotion(pitches:Array):Number {
    var totalStepMagnitude:int = 0;
    var totalSkipMagnitude:int = 0;
    
    for (var i:int = 1; i < pitches.length; i++) {
        var semitoneDiff:int = Math.abs(pitches[i] - pitches[i - 1]);
        
        if (semitoneDiff <= 2) {
            totalStepMagnitude += semitoneDiff; // Collect step semitones
        } else {
            totalSkipMagnitude += semitoneDiff; // Collect skip semitones
        }
    }
    
    var normalizedSkipMagnitude:Number = totalSkipMagnitude / (totalStepMagnitude + totalSkipMagnitude);
    var score:Number = 1 - normalizedSkipMagnitude;
    
    return score;
}

// Example usage
var melody:Array = [60, 62, 63, 67, 65, 70, 72];
var motionScore:Number = assessMelodicMotion(melody);
trace("Melodic Motion Score:", motionScore);