In terms of successes, I’ve gotten comfortable assessing my students’ learning based on pretty standard quizzes (often ones I made myself) as well as any of the assignments involving rubrics. I feel those are relatively straightforward in terms of grading, and they are reasonable representations of student learning.
In terms of challenges, I still have trouble entering grades frequently enough. My district requires basically at least one grade per week, but even without that requirement, I myself would like relatively frequent tangible evidence of student learning - at least more frequent than the quizzes and rubric-assessed assignments that happen roughly every 2 weeks (probably 1/week at most).
I end up putting some loose “participation” grades in between, but that’s really a band-aid solution. I feel it is somewhat relevant since I base this grade on whether students are actually completing the exploration activities, reflecting on concepts verbally or in writing, or showing they’re processing the concepts by writing down their protocol, etc. It probably doesn’t align with standards-based grading in the strictest sense, but it’s what I’ve been using to “fill in the gaps”.