Pugh chart

Objective	Weights
Portability	5
Ease of use	6
Good looking	3
Cost	4

Design Objective	Weight	Design 1	Design 2	Design 3	Design 4
Portability	5	datum	++	--	--
Ease of use	6	datum	-	-	+
Good looking	3	datum	+	++	+
Understandable	9	datum	+	+	+
Cost	4	datum	-	-	+
Score(+)		0	22	15	18
Score(-)		0	10	16	10
Total		0	12	-1	8

5.1 Justifications for scores given

Design no	Objective	Score alloted	Justification
1	Portability	0	Easier to carry as a box
	Ease of use	0	Used by operating with the gears
	Good looking	0
	Cost	0	Cost effective due to simple mechanism and prototype
2	Portability	2	Easy to carry as a globe from one place to another.
	Ease of use	-1	Setting of time and date is a bit complicated using this mechanism
	Good looking	1	Globe with the time displaying beautifies the prototype
	Understandable	1	User understandable as the time is displayed clearly in the digital form
	Cost	-1	Using the chain sprocket mechanism and the design makes it a bit costly
3	Portability	-2	Carrying the fragile large candles is difficult
	Ease of use	-1	The rotating candles with gear mechanism makes it complicated to use
	Good looking	2	The prototype with candles rotating and displaying time adds beauty
	Understandable	1	The Time display is simple numeric which is understandable to the user
	Cost	-1	The gear mechanism and candle sticks makes it costlier
4	Portability	-2	Large gears connected with each other make it difficult to carry
	Ease of use	1	Easier to use the clock for setting of the time due to its analog gear mechanism
	Good looking	1	Look good with big gears displaying the time and date
	Understandable	1	Analog Clock makes it easier to understand the time and date
	Cost	1	Simple analog indication with gears make it cost effective

5.2 Selected Design

5.3 Product architecture

Subsystems identified are

Sl no.	Subsystem
1	Casing unit
2	Time setting unit
3	Displaying unit
4	Interface unit

5.4 Function clustering

5.5 Interaction between subsystems

Casing unit	Time and date setting unit	Displaying unit	Interface unit
Spatial	Yes	No	Yes
Data	No	No	No
Material	Yes	Yes	Yes

Time and date setting unit	Displaying unit	Interface unit	Casing unit
Spatial	Yes	No	Yes
Data	Yes	Yes	No
Material	Yes	Yes	No

Displaying unit	Interface unit	Casing unit	Time and date setting unit
Spatial	Yes	Yes	Yes
Data	Yes	No	Yes
Material	Yes	No	Yes

Interface unit	Casing unit	Time and date setting unit	Displaying unit
Spatial	Yes	Yes	Yes
Data	No	Yes	Yes
Material	Yes	Yes	Yes