The reforms to improve the quality of public education that have been initiated on the part of suppliers of public education have been insufficient.
Conclusion (therefore / should)
Reforms must be demanded by consumers. Parents should get govt vouchers, which would pay for school at whatever school a parent chooses to send their kid.
Evidence
Reforms made by suppliers of public education have been insufficient. Academically underachieving schools will be forced to improve their academic offerings to attract students.
Evaluate
Although this is described as an argument, we could also think of it as Plan / Goal.
PLAN: the voucher system GOAL: improve the quality of public education
When we analyze plans we ask whether it can feasibly work as the author imagines (do academically underachieving schools even have the capacity to improve their academic offerings). We ask about whether people would cooperate with the plan (would parents really send their kids to the academically superior schools? would schools really improve academics to attract parents?). We ask about whether it could backfire (what if the coveted schools have too many applicants and become overcrowded and education suffers as a result).
Goal
A key assumption that needs examination is that the primary consideration for parents using the vouchers would be the academic quality of the school. If this isn't true, then the argument that the competition will improve academic standards falls apart.