====== Tutorial 5 - Packaging the Sub-systems ======

===== 3/5 =====

The models are already defined in stand-alone sub-systems, which means that each sub-system can be used as it is or by connecting it to other sub-systems. The problem is that in order to connect them a user must edit the different expressions – which is cumbersome in Ecolego and impossible to do in Ecolego Player.\\
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You will now make sure that the relevant objects are exposed to other sub-systems as model inputs or outputs.\\
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  - Right-click the //Agricultural Land// sub-system and select **Edit**.
  - Select the **Inputs** tab.
  - From the list of available objects, select the //depRate block//..
  - Select the **Outputs** tab.
  - From the list of available outputs, select the //Conc_Air//, //Conc_Dust//, //Conc_Soil// and //Leaching// blocks.
  - Click **Ok**
  - Right-click the //Concentrations in Food// sub-system and select **Edit**.
  - In the **Inputs** page, select //Conc_Soil//.
  - In the **Outputs** page, select //Conc_Crops//.
  - Click **Ok**
  - Right-click the //Doses// sub-system and select **Edit**.
  - In the **Inputs** page, select the //Conc_Air//, //Conc_Crop// ,//Conc_Food// and //Conc_Soil// blocks
  - In the **Outputs** page, select the //Dose_Total// block.
  - Click **Ok**

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**Next**

  * [[Tutorial_5-Connecting_the_Sub-systems|Connecting the Sub-systems (4/5)]]

**Previous**

  * [[Tutorial_5-Using_a_general_variable|Using a general variable (2/5)]]

**References**

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