https://community.appian.com/discussions/f/process/14250/node-inputs-vs-node-outputsHi all, I&#39;m fairly new to Appian and I&#39;m really confused about the difference between node inputs and node outputs in a process model. Can someone please explain to me when I should use each one, and why? Isn&#39;t it true that BOTH options can manipulateen-USTelligent Community 12https://community.appian.com/thread/64405?ContentTypeID=1Fri, 01 Feb 2019 18:46:51 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:7a4d93f1-c23e-4600-9c5b-622ea053c2darajesh kilaruNode Input:These are also called Activity class parameters they will be used with in the node.once the process move onto next node this Activitity class parameters are no longer usefull.<br /> <br /> Node Output:We save all the node out puts to the Process variables which can reused through out the process.<br /> <br /> Note :We save Activity class parameters also into the node outputs so that they can be used all over the process.<br /> <br /> <br /> If you know the java<br /> Activity calss parameters are localvariables <br /> Process variables are Global variables<br /> <br /> Hope This helps.<br /> <br /> <br /> Thank you!<br /> <br /> <br /> Regards,<br /> Rajesh Kilaru<div style="clear:both;"></div>https://community.appian.com/thread/64365?ContentTypeID=1Thu, 31 Jan 2019 07:00:43 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:99f29852-6eff-4085-b420-94dea84c0dd0prashantm963Hi fab,<br /> Node Inputs can be use for creating activity class parameters. Activity class parameters are use to pass values to node. <br /> Node outputs can be used to store the data processed by your node using an expression. <br /> <br /> For details information please check<br /> <a href="https://docs.appian.com/suite/help/18.4/Process_Node_and_Smart_Service_Properties.html#data-tab">docs.appian.com/.../Process_Node_and_Smart_Service_Properties.html</a><div style="clear:both;"></div>