PUGH chart

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Safety	4	+	0	Datum	+
Extent of Automation	6	+	+	Datum	-
Portability	5	-	++	Datum	-
Effectiveness	7	0	-	Datum	-
User-friendliness	4	+	--	Datum	+
Cost	9	+	-	Datum	+
Score(+)		28	16	0	17
Score(-)		0	-24	0	-18
Total score		28	-8	0	-1

Justification

Design	Objective	Weightage	Justification
1	Safety	4	Manual work to be done is less and the petri plates are placed in the trays that avoids the possibility of breaking
	Extent of automation	6	The machine automatically loads the plates onto the conveyor using slider crank and media filling is also done automatically
	Portability	5	Since the space consumption is more, it is little difficult to carry
	Effectiveness	7	It is highly efficient as there is automation in loading and filling the plates
	User friendliness	4	The machine fulfils the user's need(the user needed to load at least 3 plates per minute)
	Cost	9	The design is less complex compared to reference, it is cost effective
2	Safety	4	There is little manual work to be done in between the process, it is completely safe and friendly
	Extent of automation	6	it includes no manual work
	Portability	5	it takes very less space and weighs less, it is easily portable
	Effectiveness	7	The machine loads only one plate at a time
	User friendliness	4	The loading of only one plate at a time makes it less user friendly as it consumes more time
	Cost	9	The robotic arm inclusion makes it costly
3	Safety	4	-
	Extent of automation	6	-
	Portability	5	-
	Effectiveness	7	-
	User friendliness	4	-
	Cost	9	-
4	Safety	4	There is little manual work to be done in between the process, it is safe
	Extent of automation	6	It includes little manual work of placing the plates, automation is less
	Portability	5	It is not easily portable since it includes conveyor belt in it
	Effectiveness	7	The machine loads 3 plates at once that makes it effective
	User friendliness	4	It fulfils the need of user in good way(loading 3 plates per minute) and hence it is user friendly
	Cost	9	The machine includes less complexities that makes it cost effective

By comparing with the datum(reference design 3), weightages are justified.

After comparing all the designs with the reference on basis of certain factors, we come to an conclusion that we can select the design 1 as it is very much effective.

2.3 Function Clustering

SELECTED DESIGN

INTERACTION DETAILS

Subsystem 1(Handling unit)	Subsystem 2(Interaction unit)	Subsystem 3(Interphase unit)
Material interaction	Yes	No
Data interaction	Yes	No
Spatial interaction	Yes	No

Subsystem 2(Indication unit)	Subsystem 1(Handling unit)	Subsystem 3(Interphase unit)
Material interaction	Yes	No
Data interaction	Yes	Yes
Spatial interaction	Yes	Yes

Subsystem 3(Interphase unit)	Subsystem 1(Handling unit)	Subsystem 2(Indication unit)
Material interaction	No	No
Data interaction	No	Yes
Spatial interaction	No	Yes