Table 1

Ten second keying of two fingered adjacent lateral sequences, in kps. Average kps rate for ten experienced keyboard operators, 5 on electric; 5 on mechanical.

	Left hand			Right hand
Fingers*	1/2	2/3	3/4	3/4	2/3	1/2	% decrease fastest to slowest
Letters	as	sd	df	jk	kl	l;
Electric	6.34	7.84	9.08	11.00	8.24	6.64	jk-as=42.36%
Mechanical	3.46	3.80	4.74	5.58	3.66	3.36	jk - l; =39.78%

*Numbers for fingers: 1 = little fingers; 2 = ring fingers; 3 = middle fingers; 4 = index fingers

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Table 2

Ten second keying of two fingered contra-lateral sequences, in kps. Average kps rate for ten experienced keyboard operators.

Fingers	1	2	3	4
Letters	a;	sl	dk	fj	% decrease fastest to slowest
Electric	10.32	10.32	10.74	10.62	dk-a;=3.91%
Mechanical	7.90	8.50	8.96	8.78	dk-a;=11.83%

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Table 3

Ten second keying on fastest two-key lateral (jk) and fastest two-key contra-lateral (dk). Average kps rate for two experienced operators, each operatoron voth mechanical and electric keyboards.

			Operator 1		Operator 2
			Keyboards
Fingers	Sequence	Letters	Mechanical	Electric	Mechanical	Electric
rh 4/3	lateral	jk	5.2	9.8	6.2	9.0
3/3	contra-lateral	dk	10.1	9.6	7.2	8.5

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Table 4

Ten second keing on four-fingered inward lateral, outward lateral, and contra-lateral sequences. Average kps rate for two experienced operators, each operator on both mechanical and electric keyboards.

		Operator 1		Operator 2
		Keyboards
Sequence	Letters	Mechanical	Electric	Mechanical	Electric
INWARD lateral	asdf;lkj	5.4	6.6	6.0	11.4
contra-lateral	a;sldkfj	5.5	6.4	7.0	7.6
OUTWARD lateral	fdsajkl;	5.0	5.1	5.6	10.6
contra-lateral	fjdksla;	4.8	4.4	7.7	7.7

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Table 5

Results of ten second keying of lateral and contra-lateral sequences on 'qwerty' keyboards. Mechanical and electric. 20 operators: all right handed: 6 male 14 female.
Group 1: Experienced, Group 2: no keyboard experience,
Group 3: Experienced, Group 4: After 6 weeks' training.

*Operators designated by alpha letters.

Electric keyboards Group 1
	Fingers	Letters	A	B	C	D	E	Av.kps
Lateral	1/2	as	87	61	56	54	59	6.34
left hand	2/3	sd	105	87	64	68	68	7.84
	3/4	df	126	85	72	102	69	9.08
right hand	1/2	;l	87	69	65	51	60	6.64
	2/3	lk	113	87	69	69	74	8.24
	3/4	kj	139	107	90	116	98	11.00
	Each op. Av. kps		10.9	8.3	6.9	7.7	7.1
Contra-lateral	1/1	a;	127	107	88	98	96	10.32
	2/2	sl	115	113	83	109	96	10.32
	3/3	dk	131	114	85	111	96	10.74
	4/4	fj	126	104	89	116	96	10.62
	Each op. Av. kps		12.5	10.9	8.6	10.9	9.6
Lateral	asdf;lkj		126	104	114	71	66	9.62
	fdsajkl;		94	113	106	80	51	8.88
Contra-lateral	a;sldkfj		118	89	76	59	64	8.12
	fjdksla;		120	101	77	63	44	8.10

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Table 6

Allocation of most frequently used letters to home row keys. Percentage of letters keyed on the home row.

	All language %	100 commonest words %
Qwerty	43.62	51.88
Dvorak	73.31	86.25
Maltron Mark II	77.89	90.52

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Table 7

Number of occurrences of single finger keying twice in succession and of hurdles. All language.

	Single finger keying twice in succession	Single finger hurdles
Qwerty	273,450	82,200
Dvorak	83,700	3,474
Maltron Mark II	24,826	321

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Table 8

Percentage of index finger stretches to centre keys. All language.

	Left index finger %	Right index finger %
Qwerty	12.27	13.73
Dvorak	9.33	7.52
Maltron Mark II	4.90	5.50

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Table 9

Balance of keystrokes to each hand. Percentage of all language.

	Eight fingers only		Fingers and thumbs
	Left hand %	Right hand%	Left hand%	Right hand%
Qwerty	57.03	42.97	47.35	52.65
Dvorak	44.51	55.49	36.95	63.05
Maltron Mark II	48.76	51.23	46.00	54.00

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Table 10

Balance of keystrokes to fingers and thumbs. All language including most used punctuation and space bar.

	Left hand					Right hand
Fingers	1	2	3	4	Th	Th	4	3	2	1
Qwerty	6.7	7.2	15.7	17.75	--	17.0	15.7	7.5	10.3	2.15
Dvorak	6.75	7.2	11.0	12.00	--	17.0	14.15	11.4	11.4	9.10
Maltron Mark II	7.7	7.35	7.3	12.75	10.9	17.0	14.9	7.0	6.6	8.50

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