While sequencing your objectives, consider how each one builds off another. How might one objective prepare students for learning another? If reading critically helps students summarize an argument, you might address your critical reading objective before teaching summary.
Also, think about what your students know. Given the information they already have, which objectives would be best met at certain points in the unit? Will simpler objectives work better at the start of a unit? Will more complicated objectives make clearer sense to students after some basic objectives have already been met?
Finally, determine how your sequencing of objectives will best meet these goals and requirements for the upcoming assignment.