Assign weight to the objectives.

Objectives	Weights
Safety	7
Poratability	8
Cost	7
Efficiency	10

Pugh charts

Model Objectives	Weights	Design 1	Design 2	Design 3	Design 4
SAFETY	7	DATUM	--	-	+
PORTABILITY	8	DATUM	-	-	+
COST	7	DATUM	+	+	-
EFFICIENCY	10	DATUM	+	+	++
SCORE(+)		0	17	17	35
SCORE(-)		0	-22	-15	-7
TOTAL		0	-5	+2	+28

JUSTIFCATION FOR SCORES GIVEN

MODEL OBJECTIVES	WEIGHTS	DESIGN 1	DESIGN 2	DESIGN 3	DESIGN 4
Safety	7	Datum	The blades are sharp	The front wedges are sharp	No sharp parts
Portability	8	Datum	as the blades are out not so easy to carry	As the wedges are out	everything is inside
Cost	7	Datum	as there are no costly parts	all the parts are easily available and cheap	the drum roller motor is a bit expensive as we need very high rpm motors.
Efficiency	10	Datum	as the blades gent blunt overtime	Even though they are effective the vertical blades get blunt	the drum roller when touches the other bot it tosses them away and even damage there defensive mechanisum

SELECTED DESIGN

DESIGN 4:

FUNCTION CLUSETERING

INTERACTION BETWEEN SUB SYSTEM

SUBSYSTEM

Sl no.	Subsystem
1	Movement
2	Attacking
3	Alerting

SUB SYSTEM INTERATION

Movement	Attacking	Alerting
Material	no	no
Spatial	yes	no
Data	no	yes

Attacking	Alerting	Movement
Material	no	no
Spatial	no	yes
Data	yes	no

Alerting	Movement	Attacking
Material	no	no
Spatial	no	no
Data	no	yes