This meant we had to include some harvest related entities and relationships.This seemed straightforward enough until we tried to establish what kind of information was involved. How do you measure a harvest? The answer depends on what is being harvested. Some things you count, others you weigh and still others you measure the volume. Our resolution was to provide a reference for the thing being harvested called 'Harvest Unit'. Harvest Units each have associated measurement methods for either volume or weight categories and with each category there is a choice of units of measure