Organising Taxonomy categories

By what criterion do you need to order your taxonomy terms?

See this argument-array key:

'orderby'      => $orderby,

Per the documentation for wp_list_categories(), the orderby parameter can take the following values:

'ID' – Default
'name'
'slug'
'count'
'term_group'

Note, you may also want to add the order parameter:

'orderby'      => 'ASC',

This parameter takes:

'ASC'
'DESC'

EDIT

If I wanted to order them by ID – how would I go about that?

Using your code:

    <?php 
    //list terms in a given taxonomy using wp_list_categories (also useful as a widget if using a PHP Code plugin)

    $taxonomy     = 'workcategories';
    // THIS IS THE PARAMETER TO CHANGE
    // CHANGE IT FROM 'name' TO 'ID'
    // (NOTE CASE)
    $orderby      = 'ID'; 
    // ADD THE 'order' PARAMETER, TO
    // SPECIFY WHETHER TO SORT ASCENDING
    // OR DESCENDING (AGAIN: NOTE CASE)
    $order="ASC"   // 'ASC' for ascending, 'DESC' for descending
    $show_count   = 0;      // 1 for yes, 0 for no
    $pad_counts   = 0;      // 1 for yes, 0 for no
    $hierarchical = 1;      // 1 for yes, 0 for no
    $title="";

    $args = array(
      'taxonomy'     => $taxonomy,
      'orderby'      => $orderby,
      // DON'T FORGET TO ADD THE 'order' PARAMETER HERE, TOO
      'order'        => $order,
      'show_count'   => $show_count,
      'pad_counts'   => $pad_counts,
      'hierarchical' => $hierarchical,
      'title_li'     => $title
    );
    ?>

The ID’s don’t run in numerical order you see.

Um, that doesn’t make sense. IDs are numerical, because they are integers. Thus, ordering by ID results in an ascending or descending list of IDs, in numerical order.

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