1) Go to the Gradebook

From the Administration block on the left, select Gradebook setup.

Check whether you have a Summative category. 

2) Create a Summative category if you don't have one

If you have a Summative category, you can skip this bit.

To create a Summative category, click 'Add a category' at the bottom of your gradebook.

Name the category Summative.

Select aggregation method 'Weighted mean of grades'.

Ignore the other settings and click 'Save changes'.

3) Create your own categories

Create your own categories.  For our example class above, this will be: speaking, listening, reading and writing.

Click 'Add category'.

Give the category a name (for our example class, this will be 'Speaking').

Select the aggregation method 'Weighted mean of grades'.

Click the triangle next to the Parent category heading to expand the section.

Set the Parent category to Summative.

Then click 'Save changes'.

Repeat the process for each category you wish to create.

Click the 'Save changes' button at the bottom of your gradebook to ensure your new categories are saved.

Our example class will now look like the image on the right.

If you wish to move the order in which your categories appear, click the up and down arrow next to its name and then select its new position.

Click the 'Save changes' button at the bottom of your gradebook to ensure your new categories are saved.

In the box next to each category you have created, enter the weight that it contributes to the class total.  In our example class, the speaking and listening categories are each worth 15% of the class total, and the reading and writing categories are each worth 30% 35% of the class total.

Click the 'Save changes' button at the bottom of your gradebook to ensure your new categories are saved.

Click the box on the far right of each assessment item you would like to move to your first category.  For our example class, we will start with the Speaking Reading category.

Use the 'Move selected items to' dropdown list to select the category to into which you would like to move them.

The items will then appear in the category you have chosen.

Repeat this for the activities for each category.

Click the 'Save changes' button at the bottom of your gradebook to ensure your new categories are saved.

The weighting for assessment items is done in exactly the same way as the weighting for categories.

In the box next to each category you have createditem, enter the weight that it contributes to the class total.

If you wish all activities within a category to contribute exactly the same weight towards the class total and this cannot easily be done with weighting - as with the activities in the Reading category of our example class - you can set the category's aggregation method to 'Mean of grades'.

To the right of the category's name, click Edit and select 'Edit settings'.

Select Mean of grades and then click 'Save changes'.

Our example class would now look like the image on the right.

Click the 'Save changes' button at the bottom of your gradebook to ensure your new categories are saved.