4.4 Elementary Method "Tree Diagram" (TREE)

#### 1 Identification/Definition of the Method

/Berg, 1973/ pp. 42-43 "Project Structure Plan"

#### 2 Brief Characteristic of the Method

Objective and Purpose

The Tree Diagram (TREE) is a graph used to represent hierarchical or classifying systems, with various application possibilities. It offers a systematic overview in case of multi-level problems.

A tree diagram can be used to represent

• product structures,
• organization structures ("organizational chart"),
• goal hierarchies,
• decision situations ("decision tree"), and
• function hierarchies/structures.
When applied in the V-Model, the Tree Diagram is used to represent the product structure (the use to represent the organization structure is included in the method "organizational chart".

Means of Representation

With a tree diagram, the hierarchy of a set of nodes can be represented. The upper node has level 1, and is referred to as root. The branches of the tree refer to the predecessor and successor relations. The successor of a node with level i has level i+1, if a node has no successor it is referred to as leaf. The largest level of a tree is referred to as depth or height.

Operational Sequence

When applying the tree diagram to represent a hierarchical product structure, two structuring principles are usually available:

• function-oriented product structure planning
(here: function = submodels and its activities)
• product- or object-oriented product structure planning
(here: product or object = system and its parts)
The principle "object-orientation" has to be applied. This way the tree diagram represents the product tree according to the V-Model. The function units and the allocated documentation products have to be referred to with its defined names.

#### 3 Limits of the Methods Application

- not applicable -

#### 4 Specification of the Methods Allocation

No. Activity Description
4.1 PM1.5
Generation of Preliminary Plan
Within the scope of the project initialization, the product structure plan must be broken down as far as possible. In a project with a high degree of innovation, however, it is probable that at first only the system itself can be mentioned. On the other hand, if similar systems have already been developed, then this experience might make it possible to list segments and even configuration items.

By applying the method TREE, the subproduct Project Plan.Product Structure Plan will be completely covered.

4.2 PM4
Detailed Planning
Within the scope of the initialization of a main activity the method TREE is applied to updating and amending the product structure plan.

By applying the method TREE, the subproduct Project Plan.Product Structure Plan will be completely covered.

#### 5 Interfaces

- not applicable -

#### 6 Literature

/Berg, 1973/ Netzplantechnik - Grundlagen - Methoden - Praxis

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