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Function Hierarchy Diagrammer
Open on Existing Function
From Process Model to Function HierarchyBase Process X
D
E
C
AA
B
C
D
E
X
B
What Is a Function Hierarchy?
• Represents business processes independent of organizational, geographical, or political boundaries
• Shows how the business fits together
• Results from functional decomposition
Process Models and Function Hierarchies
Where can I model . . .Where can I model . . .
The detailed steps in a function/process?The detailed steps in a function/process? PM/FHD
The sequence of steps?The sequence of steps? PM
What starts it off?What starts it off? PM
What results from it?What results from it? PM
Where it fits with the rest of the business?Where it fits with the rest of the business? FHD
The data it uses or produces?The data it uses or produces? PM/FHD
The materials it uses or produces?The materials it uses or produces? PM
Who is responsible for it?Who is responsible for it? PM/RON
Why use FHD instead of PM?
• Vertical View Vs. Horizontal• Organizational Capability
– Reparenting Automation Functions
– Business Rules as Functions
• Documentation Capability• Organizational Preference
Building a Function Hierarchy from Scratch
11. Identify the top-level or root function.. Identify the top-level or root function.
2.2. Decompose the functions. Decompose the functions.
33. Group subfunctions.. Group subfunctions.
44. Remove all references to mechanisms.. Remove all references to mechanisms.
55. Identify common functions.. Identify common functions.
How to Decompose FunctionsCollect informationCollect information
List candidate functionsList candidate functions
Write a top-level functionWrite a top-level function
Decompose and include functionsDecompose and include functionsfrom the candidate listfrom the candidate list
Review for completeness and relevanceReview for completeness and relevance
Feedback to othersFeedback to others
Decompose to elementary level and add detailDecompose to elementary level and add detail
Elementary Business Functions
If an intermediate step is valid, the function is not elementary.
• Take the business from one state of consistency to another or do not change the state of the business at all
• Must always continue to conclusion or be totally undone
Atomic Functions
• Defined as those on lowest level of hierarchy
• Elementary Business Functions may be atomic (most frequent case)
• Could be composed of atomic functions
Stop Decomposing When . . .
• The hierarchy:– Is accurate and self-contained .– Covers the scope.– Can be read.
• The names are succinct and meaningful.
• The functions have been sufficiently decomposed.
Documentation in PM
• Automation Check Box• Timing and Cost Analysis (Main,Resources)• Presentation (Multimedia)• Descriptive Documentation (Text)
Documentation in FHD
Immediate = Form
Overnight = Report
Documentation in FHD
Documentation in FHD
Documentation in FHD
Documentation in FHD
Common Functions
Terminatemembership
Identifydelinquentmembers
Requestreturn ofoverdue
items
Invalidatemembership
of delinquent customer
Managedelinquent
memberships
Are the Functions Really Common?
• Do the functions carry out the same processing?
• Do the functions manipulate the same information?
• Do the functions have identical decompositions?
Combining Common Functions
1. Identify common business functions.
2. Trace the route back up to the common parent.
3. Replace the common functions with a single function.
Beware of Mechanisms!Mechanism:Mechanism:
We take the customer’s photograph and stick it to the bottom left-hand side of a blank card. Wefill in all the member’s details on the card. Finally, we cover the card in plastic before giving
it to the member in person or mailing it to the member.
Business Function:
Issue new membership card
Indicating Candidates for Automation
• Select the To-be-automated box• Use color• Reparent functions into a new
hierarchy
B D ECA
X
B D E