Evaluation of the PLC.
		Frequency	Percent	Valid Percent	Cumulative Percent
Valid	Bad	343	44.0	53.7	53.7
	Average	104	13.3	16.3	70.0
	Good	192	24.6	30.0	100.0
	Total	639	81.9	100.0
Missing	System	141	18.1
Total		780	100.0