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Topics: Cost Management, Schedule Management, Scheduling
Contractor’s Rhythm & Disruption
Network:22


Disruption is defined by the second edition of the Society of Construction Law’s Protocol (the “SCL Protocol”) as:
“a disturbance, hindrance or interruption to a Contractor’s normal working methods, resulting in lower efficiency. Disruption claims relate to loss of productivity in the execution of particular activities. Because of the disruption, these work activities are not able to be carried out as efficiently as reasonably planned (or as possible).”

But, as I have a deep imagination, I prefer to replace the words "Contractor’s normal working methods" and so write "Contractor’s Rhythm".

You know what; I want to define the concept of the "Rhythm" for the Contractor’s normal working methods. Then, I think we can introduce the disruption concept for the Contractor’s performance better.
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Network:70374



There are two contractor rhythms: one for staff augmentation work and one for work management.

Normal working methods for staff augmentation work is to use time & material contract, little contractor-side management, low risks for the contractor and, thus, low margins on the rates/revenues.

Normal working methods for managed work is to use fixed price contract, heavy contractor-side management, high risks for the contractor and, thus, high margins on the revenue.
...
1 reply by Mohammad Rahimi
Sep 11, 2017 2:13 AM
Mohammad Rahimi
...
Many thanks for your constructive reply. Yes, you are right about the use of fixed price contract, a kind of heavy contractor-side management, high risks for the contractor and, thus, high margins on the revenue.

But, I would like to enter the definition of "Contractor’s Rhythm" mathematically in the Project Management documents and formulations especially in Time Management Knowledge (Network Scheduling).

Nowadays, I am studying a kind of Scheduling Networks (AOA Networks) to see how I can solve this problem, and many thanks for your guide for two contractor rhythms that you said.
Network:22


Sep 10, 2017 5:49 PM
Replying to Stéphane Parent
...
There are two contractor rhythms: one for staff augmentation work and one for work management.

Normal working methods for staff augmentation work is to use time & material contract, little contractor-side management, low risks for the contractor and, thus, low margins on the rates/revenues.

Normal working methods for managed work is to use fixed price contract, heavy contractor-side management, high risks for the contractor and, thus, high margins on the revenue.
Many thanks for your constructive reply. Yes, you are right about the use of fixed price contract, a kind of heavy contractor-side management, high risks for the contractor and, thus, high margins on the revenue.

But, I would like to enter the definition of "Contractor’s Rhythm" mathematically in the Project Management documents and formulations especially in Time Management Knowledge (Network Scheduling).

Nowadays, I am studying a kind of Scheduling Networks (AOA Networks) to see how I can solve this problem, and many thanks for your guide for two contractor rhythms that you said.
...
1 reply by Stéphane Parent
Sep 11, 2017 2:27 AM
Stéphane Parent
...
Wow! Good luck with that. You may have to solve the theory of everything to get there.
Network:70374



Sep 11, 2017 2:13 AM
Replying to Mohammad Rahimi
...
Many thanks for your constructive reply. Yes, you are right about the use of fixed price contract, a kind of heavy contractor-side management, high risks for the contractor and, thus, high margins on the revenue.

But, I would like to enter the definition of "Contractor’s Rhythm" mathematically in the Project Management documents and formulations especially in Time Management Knowledge (Network Scheduling).

Nowadays, I am studying a kind of Scheduling Networks (AOA Networks) to see how I can solve this problem, and many thanks for your guide for two contractor rhythms that you said.
Wow! Good luck with that. You may have to solve the theory of everything to get there.
...
1 reply by Mohammad Rahimi
Sep 11, 2017 5:09 AM
Mohammad Rahimi
...
Without any more explanations, I would like to draw your attention to below expressions:

1- According to my study, many engineering problems could be formulated by of basic equations of networks.

For example, the basic equations governing the pipe network hydraulics are driven from
(1) the principle of mass conservation at network junctions,
(2) the principle of energy conservation in network loops and
(3) head losses relationships.

Also, the fundamental equations governing circuit analysis are derived from (1) the principle of flow conservation at circuit nodes (called KCL),
(2) the principle of energy conservation in circuit loops (KVL), and
(3) branch equations.

Or, the static structural models of trusses usually are described by three sets of the fundamental equations. These equations include:
(1), the equilibrium equations which relate the internal member forces to the external loading;
(2), the constitutive equations that describe material behavior by stress-strain law; and
(3), the geometric equations, also known as the kinematic equations, express how the strains relate to the displacements.

Or, ....

So, it is supposed that many engineering problems could be formulated by three sets of basic equations of networks.

For all engineering problems, it can be considered two basic types of variables:
(1) current-like variables,
(2) potential-like variables.
For example, for three before mentioned fields, you may find these two kinds variables.


2- I have applied above-mentioned considerations in two engineering problems as below:
2-1- My first paper was published that was "A Graph Portioning Approach for Hydraulic Analysis-Design of Looped Pipe Networks".

2-2- The second one is "A New Methodology for Circuit Analysis with
Circuit Design Capability (Reverse Analysis)". It was published in the "Journal of Circuits, Systems, and Computers".


3- I have some idea for applying this theory for other engineering fields. As I think, it could be applied for the formulation of Time Management Knowledge (Network Scheduling) in Project Management.

In other words, I am trying to model the Scheduling Networks as AOA Networks that they are two basic variables;
(1) Time (as potential-like variable)
(2) Resources (as current-like variable)

What I mean by Resources are all resources such as staff, facilities, equipment, and even cash money. I believe in flow of Resources in AOA Networks.

Anyhow, nowadays, I am working on these topics.

4- However, I feel the "rhythm of activities" in Scheduling Networks is another issue that should be taken into account. In other words, the concept of rhythm must be considered for assigning of the Resources for the activities in the specific time intervals.
Network:22


Sep 11, 2017 2:27 AM
Replying to Stéphane Parent
...
Wow! Good luck with that. You may have to solve the theory of everything to get there.
Without any more explanations, I would like to draw your attention to below expressions:

1- According to my study, many engineering problems could be formulated by of basic equations of networks.

For example, the basic equations governing the pipe network hydraulics are driven from
(1) the principle of mass conservation at network junctions,
(2) the principle of energy conservation in network loops and
(3) head losses relationships.

Also, the fundamental equations governing circuit analysis are derived from (1) the principle of flow conservation at circuit nodes (called KCL),
(2) the principle of energy conservation in circuit loops (KVL), and
(3) branch equations.

Or, the static structural models of trusses usually are described by three sets of the fundamental equations. These equations include:
(1), the equilibrium equations which relate the internal member forces to the external loading;
(2), the constitutive equations that describe material behavior by stress-strain law; and
(3), the geometric equations, also known as the kinematic equations, express how the strains relate to the displacements.

Or, ....

So, it is supposed that many engineering problems could be formulated by three sets of basic equations of networks.

For all engineering problems, it can be considered two basic types of variables:
(1) current-like variables,
(2) potential-like variables.
For example, for three before mentioned fields, you may find these two kinds variables.


2- I have applied above-mentioned considerations in two engineering problems as below:
2-1- My first paper was published that was "A Graph Portioning Approach for Hydraulic Analysis-Design of Looped Pipe Networks".

2-2- The second one is "A New Methodology for Circuit Analysis with
Circuit Design Capability (Reverse Analysis)". It was published in the "Journal of Circuits, Systems, and Computers".


3- I have some idea for applying this theory for other engineering fields. As I think, it could be applied for the formulation of Time Management Knowledge (Network Scheduling) in Project Management.

In other words, I am trying to model the Scheduling Networks as AOA Networks that they are two basic variables;
(1) Time (as potential-like variable)
(2) Resources (as current-like variable)

What I mean by Resources are all resources such as staff, facilities, equipment, and even cash money. I believe in flow of Resources in AOA Networks.

Anyhow, nowadays, I am working on these topics.

4- However, I feel the "rhythm of activities" in Scheduling Networks is another issue that should be taken into account. In other words, the concept of rhythm must be considered for assigning of the Resources for the activities in the specific time intervals.

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