Do I need CITKK00, and what is CA Common Component for IMS Tools ?

Document ID : KB000076617
Last Modified Date : 06/04/2018
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 Installing R20 will also need to install the USS part.
Trying to understand what I need to do to install the IMS tools at my site. I have downloaded the V20 paxfile and have "unpaxed" it as well as then did an unzip to get the CAI.SAMPJCL. I am now going through to customize the JCL in CAI.SAMPJCL and I see the following in the IMTAREAD member of the CAI.SAMPJCL: IMT03ALU- Allocate product USS Datasets (Only required if installing CITKK00) IMT06MKD- Allocate product USS Directories (Only required if installing CITKK00) IMT15CSU- Customize SMP/E CSI for USS (Only required if installing CITKK00) I also see this reference in IMT03ALU of "This member contains the JCL to create z/FS dataset(s) required for product: CA Common Component for IMS for z/OS." I see in the "CA Database Management Solution for IMS for z/OS - 20 Incremental" that I need to Allocate and mount the USS file system if I am installing CITKK00. How do I know if I need this? Did not see any of this when installing V18.  
R20 Incremental Install
In R20 we added Conditional Reorg as a part of our ITK component. ITK component is mandatory, because other tools are dependent on it. Since Conditional Reorg is running on USS we also enhanced our installation process with the USS part. It means that all users installing R20 will need also install this USS part. 
Additional Information:
There are more plans for future where more products will use USS and JAVA. This enhancement will also help our customers to be prepared to run our future tools written in Java and use all new features and technologies offered by this enhancement.  We will also update our documentation, because we are missing this enhancement in our enhancement page.