Table 14.

Design function weight ranking summary.

Priority	Design function	Score	Rank
First level	Anti-fouling surface materials F3	1.57	1
	Avoid sharp corners F1	1.51	2
	Seat ergonomics F6	1.51	3
	Breastfeeding support structure F9	1.46	4
	Structurally sound and reasonable F5	1.38	5
	Anti-slip treatment F2	1.27	6
	Cushion comfort F7	1.19	7
	Solid material F4	1.07	8
Second level	Harmonious proportions and curves F11	0.88	9
	Adjustable size seat F8	0.87	10
	Charging Socket F12	0.72	11
	Constant-temperature heating lumbar support F13	0.68	12
	Storage space F10	0.56	13
Third level	Emergency call button F15	0.36	14
	Integrated Speaker F14	0.18	15