Soap Preparation.
To prepare soap, heat fat/oil and add sodium hydroxide solution. Stir continuously until saponification occurs. Once the soap is formed, allow it to solidify, then inspect it for texture and lathering ability.
Inspection.
Check the soap's purity, texture, and lathering ability to confirm it meets the required standards.
\[
\boxed{\text{Soap prepared and ready for inspection.}}
\]