|Introduction to Basic I-TRIZ|
Build a Functional Model and Formulate Tasks
According to the formula below, there are at least two approaches to increasing system ideality: (1) increase the number or magnitude of the useful functions; and (2) reduce the cost, number, or magnitude of the harmful functions.
To look for ways to increase a system's ideality it is necessary to create a functional model - a cause-effect diagram that describes the system's functions and the relationships between them. Functional modeling is also a powerful method for "untangling" a complicated situation. The basic elements of a functional model are functions and links. A link defines the relationship between functions.
To build a functional model:
1. Identify the useful and harmful functions related to the problem. A function is an activity, action, process, operation or condition. Functions are either Useful (green box) or Harmful (red box).
2. For each function you define, ask yourself the control questions below. Based on your answers to these questions, continue creating the functions that contribute to the problem situation.
3. Identify the relationships between the functions by connecting the boxes with arrows. We will use two types of links: produce (an arrow) and counteract (a crossed arrow). Reveal the Contradiction by looking for functions that have both a useful and harmful outcome.
4. Formulate the following Tasks:
5. You are ready now to Generate Ideas using Directions and Operators.