Exercises: Applying the four evaluation criteria

Match each evaluation criterion with the question that corresponds to it and explain the difference between effectiveness and efficiency with a school example, for instance a computer in the lab. Criteria: effectiveness, efficiency, reliability, feasibility. Questions: does it meet the goal it was made for?; does it always work equally well, without failing?; is it possible to carry it out with the resources we have?; does it use the minimum resources needed?

A community bakery tests two firewood ovens. Oven A bakes 36 pieces with 6 kg of firewood; oven B bakes 54 pieces with the same 6 kg. Calculate the pieces per kilogram of each oven, decide which one is more fuel-efficient and explain why an oven can be more efficient but not necessarily more effective (think about how the pieces come out).

Two water pumps supply a school's rooftop tank. Pump X fails on average once every 30 days; pump Y, once every 90 days. Estimate how many failures each one would have in 365 days and decide which one is more reliable, explaining the criterion you used.

A school in a community without piped water must choose between two systems. Option 1: a rooftop tank with an electric pump that costs $\$4,800.00$ and spends about $\$180.00$ of electricity per month; it delivers water whenever there is electricity, but the community has frequent outages. Option 2: a ferrocement cistern with rainwater harvesting that costs $\$9,600.00$, spends almost nothing per month, but depends on rainfall and there are 3 very dry months. The available budget is $\$10,000.00$. Evaluate both options with the four criteria (effectiveness, efficiency, reliability and feasibility) and justify your recommendation.