2 Time Axis Design as an EcoDesign Method
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2.5.2 Define a Persona and Draw Use Case Scenarios
When considering temporal changes of a design object, it is necessary to consider
the user who uses the product and the place of use of the product. In this method, the
designer clarifies them by describing persona of a user and his/her use case scenarios.
2.5.3 Extract Temporal Changes from Use Case Scenarios,
Identify Key, and Select Countermeasures
From the described use case scenario, the designer extracts all plausible temporal
changes of the design object, the user, and the places of use. Second, the designer
identifies a type for each extracted temporal change with referring Table 2.2 and
classifies the temporal changes into two types of timescale.
Third, the designer selects countermeasures corresponding to the selected types
of the changes.
By using the uniform expression about the type of the temporal changes summarized in Tables 2.2, 2.3 and 2.4 and the database of the cases, we think the designer
can create design ideas efficiently.
2.5.4 Find Out Design Ideas and Derive a Design Solution
The designer finds out design ideas that can realize the countermeasures selected in
Sect. 2.5.3. Then, by selecting appropriate countermeasures and integrating them,
the designer derives a design solution.
2.6 Case Study
2.6.1 Problem Setting
We executed time axis design based on the proposed method in Sect. 2.5. In this paper,
we take an umbrella as a design object. The reason why we choose an umbrella is
that it is one of the most popular products daily used by everyone. Therefore, when
proposing design ideas about an umbrella, we easily assume the shape, the size, and
use case. In this case study, the product service system at the beginning is not clear.
27
2.5.2 Define a Persona and Draw Use Case Scenarios
When considering temporal changes of a design object, it is necessary to consider
the user who uses the product and the place of use of the product. In this method, the
designer clarifies them by describing persona of a user and his/her use case scenarios.
2.5.3 Extract Temporal Changes from Use Case Scenarios,
Identify Key, and Select Countermeasures
From the described use case scenario, the designer extracts all plausible temporal
changes of the design object, the user, and the places of use. Second, the designer
identifies a type for each extracted temporal change with referring Table 2.2 and
classifies the temporal changes into two types of timescale.
Third, the designer selects countermeasures corresponding to the selected types
of the changes.
By using the uniform expression about the type of the temporal changes summarized in Tables 2.2, 2.3 and 2.4 and the database of the cases, we think the designer
can create design ideas efficiently.
2.5.4 Find Out Design Ideas and Derive a Design Solution
The designer finds out design ideas that can realize the countermeasures selected in
Sect. 2.5.3. Then, by selecting appropriate countermeasures and integrating them,
the designer derives a design solution.
2.6 Case Study
2.6.1 Problem Setting
We executed time axis design based on the proposed method in Sect. 2.5. In this paper,
we take an umbrella as a design object. The reason why we choose an umbrella is
that it is one of the most popular products daily used by everyone. Therefore, when
proposing design ideas about an umbrella, we easily assume the shape, the size, and
use case. In this case study, the product service system at the beginning is not clear.