Being able to construct a learning progression from simple facts to important concepts or simplex skills to complex ones is our daily bread and butter.  The ability to do this really well sets some teachers apart.  It helps create a focus on learning within the classroom rather than just being busy.  Whilst the sequencing of knowledge is a crucial starting point the real star teachers also know the points at which key misunderstandings or mistakes are often made by pupils.  In the classroom they are already alert to these possible errors and can intervene quickly and incisively.  Teachers spending time planning together must focus on the learning progressions or journeys, if you prefer.  A critical element of this planning is the determining of excellence; what standard should these pupils be able to reach.  My suggestion would be start with the end in mind; what kep concept or complex skill are you trying to teach.