---
title: "Step 1 - Define input parameters"
canonical: "https://help.vicon.com/space/ProCalc16/12649941/Step%201%20-%20Define%20input%20parameters"
format: markdown
---
Before you begin, ensure you have unzipped the ProCalc tutorials data as described in [About the data for this tutorial](https://vicon-help.atlassian.net/wiki/spaces/ProCalc16/pages/12648480/Vicon+ProCalc+Kinetics+Tutorial#AboutData).

For this tutorial, we will use a walking trial where the subject makes contact with two separate force plates. 

1. Start ProCalc.
2. On the  **Data Management** tab, navigate to the **Kinetics **session folder.
3. From there, double-click **Walking01 **to load the trial.

## Define input parameters

For kinetics calculations, we need to use the subject's body mass. We can specify their body mass by using an Input Parameter.

**To define Input Variables:**

1. Navigate to the **Input Parameters** tab.
2. Create a new Input Parameters scheme > Macro (inline-media-image)

.
3. Create a new Input Parameter called **Bodymass**.
4. From the **Subject Measurements** list, select **Bodymass** and click **Use**.
  Notice that the Type, Quantity, and Unit automatically changed when assigning the subject measurement.
5. Save the Input Parameters scheme.

We are now ready to create a scheme within the Variables tab.