Work Items are a list of things to do on a job. They are lower than tasks, (aka stages or phases). They are small steps of work that can be ‘ticked off’ as they are completed. If you already have a QA Check List of some sort for each job/project, then Abtrac Work Items are quite possibly the exact same concept. Examples of a work item might be a day-long site visit, or a 4 hour piece of work in the office to write a report. Each of these and more may all be under a task (aka stage or phase) of ‘Feasibility Planning’.
Most offices start the week and look ahead several weeks when sketching out work to be done and spreading it around the office for people to do. Using Abtrac work items, the benefit is that everyone knows what is being done and how long it is expected to take.