Step 1

selection of the predicative component of the main part:

beobachten/aufstehen

Step 2

selection of the predicative component of the subordinate part:

gehen/vernehmen

Step 3

selection of the subject of the main part → matching the subject and the predicative component in person and number:

er/sie

Step 4

selection of the subject of the subordinate part → coordination of the subject and the predicative component in person and number:

das Mädchen/sie

Step 5

selection of means of communication:

wohin/als

Step 6

choosing the location of the parts of the speech utterance: the subordinate part is in the pre- or postposition:

the subordinate in the postposition / subordinate in the preposition

Step 7

selection of actors – participants in the action of the main/subordinate part (object, if available in the positional structure of the sentence):

-/Schritte