Diagram 2, Offshore Schedule Comparison
Diagram 1, Onshore Schedule Comparison
Two examples, one Onshore, the other Offshore illustrate a  Programme  showing the restraints  from not using pre prepared work ie Modules, Existing Hulls etc, Diag covers Offshore, Diag 2 Onshore
The Diagram 2  illustrates the areas of activity that using Modules allows you to reduce the Programme duration for completing an Offshore Project, it uses a simple Example for  the Production of an FPSO . 2a)  uses Modules but  also uses a purpose Built Hull. 2b) uses an existing Hull which has a shorter period to convert to receive the modules than the protracted period of building the Purp[ose Built Hull
The Diagram 1 illustrates the areas of activity that using Modules allows you to reduce the Programme duration for completing an On shore Project, it uses a simple Onshore Project Example. By using Modules, Modularisation 1 a), the  Project has the advantage to commence the modules whilst the site is being prepared so that there then is less to do onsite to complete the works. In 1 b) the Project has a more protracted On Site  period to build the complete plant from piece smalll  (sticks).
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MODULEitus
General
Index, 1 INTRODUCTION,  Aspects
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a general understanding of Modules 
Level 1
Level 2
Level 2