You are teaching in class with a focus not only on the subject area, but also on SUPPORTING TRANSVERSAL SKILLS. You want to assess students' performances in a holistic manner: You do not only want to assess learning products but also the learning process itself.
It is difficult to get an insight into a student's learning process. The learning process can be only analyzed retrospectively.
Therefore, use the EPORTFOLIO-approach in class, a specific form of a content-management-system (CMS), which allows the collection and presentation of artifacts. The collected learning products can be linked to the learning process. This way, a basis for documentation, reflexion and presentation of learning is established. The teacher, who is an "outsider" to the students learning process, can gain a holistic understanding of the students learning pathway and is able to assess both, the process and the product of learning.
Students document the learning process through an online learning journal. Furthermore, they collect learning products. This evidences of learning are the basis for ASSESSMENT, FEEDBACK, RECOGNIZING, APPRECIATING and EVALUATING.