Weightage to the objectives:

Sl.no	Objectives	Weightage
1.	User-friendly	6
2.	Portability	9
3.	Reusable materials	4
4.	Cost	5
5.	Aesthetics	6

PUGH CHART:

Design Objectives	Weightage	Design 1	Design 2	Design 3	Design 4
User friendly	8	+	DATUM	+	+
Portability	7	+	DATUM	+	+
Reusable materials	4	-	DATUM	-	-
Cost	5	+	DATUM	+	+
Aesthetics	6	++	DATUM	-	+
Score(+)		32	0	20	26
Score (-)		-4	0	-10	-4
Total		28	0	10	22

Justifications for the given score:

Concepts	Objectives	Score given	Justification
1.
	User-friendly	++	It is very easy to use because it has mobile authentification as nowadays it is most common that every guy knows the usage of a smartphone so that only the user can access it
	Portability	+	It is portable such that we can carry it everywhere and it is handy to use. It has good grip to hold it
	Reusable materials	-	Some of the materials used here can be reused to have some other locking gadgets
	Cost	+	As per the cost given by the user this is the good choice so that we can approach the constraint of the user
	Aesthetics	++	It has an aesthetic appreciation
2.
	User-friendly	0	As compared to the selected design it is the design which is not much securable
	Portability	0	It is also portable but the volume which we hold feels uncomfortable
	Reusable materials	0	Here also the components can be reused for other locking equipment .
	Cost	0	Here the cost becomes very expensive as we have to install fingerprint reader and hence the user doesn't prefer it
	Aesthetics	0	It is not an efficient model compared to the selected design
3.
	User friendly	+	It is easy to use but here we use an RFID card so it is unsecured that some other anonymous may take the RFID card
	Portability	+	It is portable but the design is not handy and is not stable when we place it on the surface.
	Reusable materials	-	Here also some of the materials can be reused
	Cost	+	Here the cost becomes expensive due to the usage of RFID card reader
	Aesthetics	-	As per this point of view it looks good but not efficient compared to the selected model
4.
	User friendly	+	It is not that easy to use because fingerprint reader can misuse
	Portability	+	It is not portable because it needs a power supply without which it cant be opened
	Reusable materials	-	here the materials also can be reused
	Cost	+	here the cost becomes more expensive from user perspective
	Aesthetics	+	It is also an aesthetic product.

SELECTED DESIGN:

Subsystems identified:

1.Locking mechanism

2.User interface

3.Casing

FUNCTION CLUSTERING:

Interaction between subsystems:

Locking mechanism	User interface	Casing
Material Interaction	No	Yes
Data Interaction	No	Yes
Spatial Interaction	No	Yes

User Interface	Locking mechanism	Casing
Material Interaction	No	No
Data Interaction	Yes	Yes
Spatial Interaction	No	No

Casing	Locking mechanism	User Interface
Material Interaction	Yes	No
Data Interaction	Yes	No
Spatial Interaction	No	Yes