1. Changing a bed sheet poses two problems
1) Process Problem :
- difficult and hard work to lift up a heavy mattress when changing
2) Function Problem :
- the bed sheet is disorder and not in good shape after night sleep
Quick & Easy
Maintain neatness &
tidiness
Increase housekeeper’s
productivity
Avoid injuries &
harmful
Affordable &
Young kids able to marketable product
perform
2. Problem
Function
Process
Analysis
Cause & Effect Chain
Analysis
Zone of Conflict
Sub Field Model
Smart Little People
Function Oriented
Search
3. Zone Useful : the mattress
Zone Harmful : Mattress
Sides
Mechanical
Field
Mattress
S1
Bed Sheet
S2
Mechanical
Field
Mattress
Bed Sheet
S1 ?
S2
4. 1 2
The SLP either needs to
* hold (mechanically)
* adhere (chemically)
* stick (mechanically)
* connect (mechanically)
the bed sheet to the mattress
3
- Add substance to the bed sheet
- The substance needs to have
the capability to hold, adhere,
stick or connect the bed sheet
with the mattress.
4
Function Oriented
Search was selected
5
Step 1 :
Background of the problem
Changing and fitting bed sheets is a tough job
Step 2 :
Desired characteristic of new system
- Quick and easy
- Maintain the tidiness
- Simplify the process
Step 3 :
Identify the problem
(Problem Statement)
Step 4 :
The function to be performed
- to cover the mattress
- able to change & replaced easily
- Remain net and tidy all the time
Step 5 :
Formulate the required parameters
- Faster
- Neat and Tidy
- Low Cost
Step 6 :
Generalize the function
- Changing process should be quick and easy
Step 7 :
Identify leading technologies which
perform the similar function
- Google search
Step 8:
Adapt the solution to the specific system.
5. No. Type Pros Cons
1. Temporary Fabric Adhesive Spray • Fast
• Easy
• Simple
Cons
• Fume
• Bad Smell
• Non reusable
• Non-ecofriendly
• Might cause skin allergic
• Need to spray on the bed sheet and mattress and its
take time
2. Toupee Tape • Simple
• Easy to
apply and
remove
• Non reusable
• Hold for less than 24 hours
• Non-ecofriendly
• Need to align the tape on both side of mattress and
bed sheet will take time
3. Velcro • Simple
• Cheap
• Lift span is short
• Less holding forces
• High possibility to damage bed sheet fabrics when
washer is used
• Need to align the Velcro and it takes time
4. Zip • Easy to get
• Cheap
• The steel on the zip will rust
• Life span is short
• The teeth of zip easy spoil
• Need to align the zip and it takes time
5. Cloth Button • Easy to get
• Cheap
• Variety
• Simple
• Changing bed sheet take longer time to fasten
• The surface of the bed sheet is not smooth when
button up
• Easy to lose as its touchable on the surface of bed
sheet
• Is not convenient to old people who has poor
eyesight
6. Snap Button • Easy to get
• Cheap
• Great
holding
forces
• Will spoilt after long time use
7. Stripe • Cheap • Easy to lose
• Holding force not great
• Take long time to fasten the strip
