IM caters to the area of Workflow & Documents or Requirements & Validation and SI is Source Management and Integrations (Eclipse, Visual Studio..)
Hope that helps.
Can you more elaborate over the PTC-SI ?
Does PTC-IM refers to the common entities and common purpose of PTC-IM/
Why there two differentiator in PTC, like PTC-IM and PTC-SI?
There is no "PTC-IM" or "PTC-SI".
"PTC" is the name of the company. There are no "IM" or "SI" products, it doesn't matter what the (very) old names are.
The name of the product is now "Windchill RV&S", this is what you need to research. However, I tried to find some information about it on PTC's web site so I could give you a link, but I can't find anything. It seems PTC is promoting "Windchill PLM" and trying to hide "RV&S".
"IM" and "SI" are very old names, They have been used while the Tool has been developed by Company "MKS Inc." which has been taken over by PTC Inc.
Officially they have never been combined with MKS-SI / MKS-IM or PTC-SI / PTC-IM.
Long written it has been:
IM = "Integrity Manager", today known as "Workflow & Documents"
SI = "Source Integrity", today known as "Configuration Management"
If possible, you should avoid in your Company to use the Words SI and IM
Once done, you will never get it out of the Heads of your User.