Tool 18: Block Diagram

AKA

Function Block Diagram

Classification

Analyzing/Trending (AT)

Tool description

The block diagram illustrates, at an overview level, how a process flows from function to function or from unit to unit within an organization. The diagram uses blocks to reflect the most important activities and links them together by connecting lines that represent material or communication flows.

Typical application

• To provide a high-level view of a process.

• To promote an understanding of process function and sequence.

• To identify cross-functional unit interfacing.

Problem-solving phase

	Select and define problem or opportunity
→	Identify and analyze causes or potential change
→	Develop and plan possible solutions or change
→	Implement and evaluate solution or change
	Measure and report solution or change results
	Recognize and reward team efforts

Typically used by

	Research/statistics
	Creativity/innovation
5	Engineering
1	Project management
	Manufacturing
4	Marketing/sales
3	Administration/documentation
	Servicing/support
2	Customer/quality metrics
	Change management

links to other tools

before

• Process analysis

• Work flow analysis (WFA)

• Problem analysis

• Work breakdown structure (WBS)

• Systems Analysis Diagram

after

• Organization Chart

• Process Mapping

• Potential problem analysis (PPA)

• Functional Map

• Activity analysis

Notes and key points

Step-by-step procedure

• STEP 1 The team identifies all functions or activities within a process and checks where the start and stop functions are, as determined by team consensus. See example Development of an Employee Training Program.

• STEP 2 The functions are sequenced and drawn on a whiteboard or flip charts in a block diagram format.

• STEP 3 The team verifies that all blocks (functions) are accounted for and drawn in the proper sequence to accurately reflect the current process.

• STEP 4 Finally, additional supporting information is added and the diagram is dated, as shown in the example.

Example of tool application