Pugh chart

Assigning weights to objectives

objectives	Weights
Safety	6
Portability	5
Ease of use	8
Cost	7

pugh chart with four different designs

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Safety	6	0	Datum	++	0
Portability	5	-	Datum	-	-
Ease of use	8	+	Datum	-	++
cost	7	0	Datum	0	+
score(+)		8	0	12	23
score(-)		5	0	13	5
Total score		3	0	-1	18

Justifications for scores given

As design 4 satisfied most of the needs and seemed to be the most feasible for our project, it is being selected as the final design for our prototype.

6.1 Selected design

6.2 Functional Clustering

6.3Interaction between subsystems

Storage unit	Interface unit	Dispensing unit	Crushing unit
Material interaction	no	yes	yes
Data interaction	Yes	no	no
Spatial interaction	no	yes	no

Interface unit	Storage unit	Dispensing unit	Crushing unit
Material interaction	no	no	no
Data interaction	Yes	Yes	Yes
Spatial interaction	no	no	no

Dispensing unit	Storage unit	Interface unit	Crushing unit
Material interaction	Yes	no	Yes
Data interaction	no	Yes	no
Spatial interaction	Yes	no	no

Crushing unit	Storage unit	Interface unit	Dispensing unit
Material interaction	Yes	no	Yes
Data interaction	no	Yes	no
Spatial interaction	no	no	no