Glass Box Representation.

Identified Sub System list:

SI.No	Sub System name
1	Sensing unit
2	Cleaning unit
3	Polishing unit

Interaction details:

1. Material Interaction:Solids,Liquids and gases that flow from one sub system to next.
2. Energy Interaction:Energy that must be transmitted or shielded between sub systems.
3. Data Interaction:Signals (tactile,acoustic,electrical,visual,etc.)that must be processed from one sub system to the next.
4. Spatial Interaction:Geometrical dimensions,degree of freedom,tolerances and constraints that must be maintained between the sub systems.

Sub system 1

	subsystem 2	sub system 3
Energy Interaction	NO	NO
Data Interaction	YES	NO
Material Interaction	YES	NO
Spatial Interaction	YES	NO

Explanation: When the shoe is kept on the machine the machine should sense the shoe and give indication so there is data interaction between sub system 1 and 2. After sensing the shoe must be transferred to cleaning part so there is material interaction. After cleaning the shoe must be transmitted to polishing part there is no spatial interaction.

Sub system 2

	Sub System 1	Sub System 3
Energy Interaction	NO	NO
Data Interaction	YES	YES
Material Interaction	YES	YES
Spatial Interaction	NO	YES

Explanation:The machine starts cleaning and completes cleaning by giving an indication,hence there is data interaction.The shoe has to be transferred from cleaning part to polishing part so there is material interaction between sub system 2 and sub system 3.To clean and polish, the motors have to run so there is spatial interaction in between sub system 2 and sub system 3.

Sub system 3

	Sub System 1	Sub System 2
Energy Interaction	NO	NO
Data Interaction	YES	YES
Material Interaction	YES	YES
Spatial Interaction	NO	YES

Explanation:

The shoe has to be moved from cleaning part to polishing part so there is material interaction between sub system 2 and sub system 3.To polish the shoe, the brushes have to run,the brushes are connected to motors.So there is spatial interaction.After polishing the machine has to give indication so there is data interaction.