The notion of constructive alignment works from the idea that the learner constructs his or her own learning through relevant learning activities. The job of the teacher/lecturer is therefore to create a learning environment that supports the learning activities appropriate to the relevant learning outcomes.
According to Biggs (1999) the key to achieving this alignment is to ensure that all components in the teaching system (such as teaching methods, assessment tasks, etc) are aligned with the learning activities associated in the intended learning outcomes.
From an online/blended learning perspective the key lesson to take from this is that technology should not drive the choice of learning activities. Any technology should only be used if it can aid the a learning activity that is associated with the intended learning outcomes.