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K. Watanabe et al.
2.6.2 Define a Persona and Draw Use Case Scenarios
We described the use case scenario as follows:
Persona
A Man, 30 years old, office worker
He often goes out for work with his umbrella in rainy days.
Use Case Scenario
On a sunny day, he does not use his umbrella. When it rains or snows all day, he
uses his umbrella from his house to his office. He sometimes loses his umbrella on
the public transportation. When the wind is strong, he closes the umbrella and stops
using it. If he dares to use it, the umbrella might be flapped by the wind, breaking
the bones and the surface cloth. When the same umbrella is used for long time,
the bones of the umbrella become rusty and it becomes difficult to open and close.
Furthermore, the bones are distorted according to time and the cloth also breaks,
and the water-repellent function is deteriorated. When the umbrella can no longer
prevent rain or he gets bored with the design of the umbrella, he replaces it with a
new umbrella of desired color and stops using the old one.
We described this persona and use case scenario since we often see in daily life.
2.6.3 Extract Temporal Changes from Use Case Scenarios,
Identify Key, and Select Countermeasures
Next, we extracted plausible temporal changes from the use case scenario and related
them to types of temporal changes in Table 2.2. Then, we classified the temporal
changes into two timescale. In this case study, the short time scale is one cycle for
using an umbrella. Table 2.5 shows the results of this step.
For each type of temporal changes, we selected countermeasures by using
Table 2.4 and the database.
2.6.4 Find Out Design Ideas and Derive a Design Solution
We found out design ideas for the countermeasures. Table 2.6 summarizes the design
ideas.
As a result of integrating the design ideas, the result of devised design solution is
described as below.
Design solution
The Umbrella is made of cloth that is more water-repellent when we use. The
number of the bone can be changed and even if several bones are broken, it could
be dealt with by the rearrangement. The umbrella can be changed to a raincoat
according to the user’s mood. If the bones get rusty or the cloth deteriorates, the
K. Watanabe et al.
2.6.2 Define a Persona and Draw Use Case Scenarios
We described the use case scenario as follows:
Persona
A Man, 30 years old, office worker
He often goes out for work with his umbrella in rainy days.
Use Case Scenario
On a sunny day, he does not use his umbrella. When it rains or snows all day, he
uses his umbrella from his house to his office. He sometimes loses his umbrella on
the public transportation. When the wind is strong, he closes the umbrella and stops
using it. If he dares to use it, the umbrella might be flapped by the wind, breaking
the bones and the surface cloth. When the same umbrella is used for long time,
the bones of the umbrella become rusty and it becomes difficult to open and close.
Furthermore, the bones are distorted according to time and the cloth also breaks,
and the water-repellent function is deteriorated. When the umbrella can no longer
prevent rain or he gets bored with the design of the umbrella, he replaces it with a
new umbrella of desired color and stops using the old one.
We described this persona and use case scenario since we often see in daily life.
2.6.3 Extract Temporal Changes from Use Case Scenarios,
Identify Key, and Select Countermeasures
Next, we extracted plausible temporal changes from the use case scenario and related
them to types of temporal changes in Table 2.2. Then, we classified the temporal
changes into two timescale. In this case study, the short time scale is one cycle for
using an umbrella. Table 2.5 shows the results of this step.
For each type of temporal changes, we selected countermeasures by using
Table 2.4 and the database.
2.6.4 Find Out Design Ideas and Derive a Design Solution
We found out design ideas for the countermeasures. Table 2.6 summarizes the design
ideas.
As a result of integrating the design ideas, the result of devised design solution is
described as below.
Design solution
The Umbrella is made of cloth that is more water-repellent when we use. The
number of the bone can be changed and even if several bones are broken, it could
be dealt with by the rearrangement. The umbrella can be changed to a raincoat
according to the user’s mood. If the bones get rusty or the cloth deteriorates, the