How Schedule Success Drives Maintenance Performance

In the world of maintenance planning, the term schedule success offers a more accurate reflection of performance than the traditional focus on schedule compliance. While compliance implies a punitive relationship between supervisors and the schedule, success acknowledges that the plant’s reality can override a pre‑set plan.

Consider a supervisor whose bonus is tied to compliance. When an emergency arises, the supervisor must decide: keep the crew on the scheduled tasks and risk losing the bonus, or divert resources to address the urgent issue and potentially face a penalty at year‑end. This tension creates stress and erodes trust between staff and management.

By measuring schedule success, the organization shifts the narrative. The schedule remains a guide, not a hard deadline. When emergencies occur, supervisors can legitimately adjust the plan without penalty, provided they keep the plant running. The focus becomes proactive maintenance that prevents breakdowns, rather than reactive compliance.

What constitutes a healthy schedule success score? John Crosson, a Clorox leader who spoke at the 1997 SMRP conference, described schedule success as the “ultimate measure of proactivity.” A high score indicates that preventive work is being performed before equipment fails, whereas a low score often signals that equipment is aging or that maintenance is reactive.

Many facilities accept success rates between 60 % and 70 %. Even with such a rate, disciplined scheduling typically yields more completed work than a laissez‑faire approach, especially when emergencies cannot be avoided. Importantly, the score reflects plant condition and the effectiveness of preventive strategies, not the willingness of supervisors to sacrifice pay.

Measuring success can be done in several ways. One approach counts job starts: if a crew receives 1,000 scheduled hours and starts 850, the success rate is 85 %. This method rewards the critical step of getting work underway, which is often the most decisive factor in keeping equipment reliable. Alternative metrics include job counts (e.g., 30 scheduled jobs, 20 started equals 67 %) or job completions. However, using completions can penalize supervisors for small delays caused by paperwork or unforeseen complications.

Partial credit for jobs—crediting only the portion of a job that was finished—introduces complexity and can misrepresent actual performance. Time estimates are inherently uncertain; a 20‑hour job may extend to 30 hours, or it may finish in 18. Assigning credit based on partial completion therefore creates confusion and does little to drive the desired outcome of more work completed.

Ultimately, schedule success is a tool to encourage the behaviors that lead to more work being finished and to gauge the overall reliability of plant equipment. It signals whether the maintenance plan is effectively preventing breakdowns and enabling smooth operations week after week.

Doc Palmer, author of the Maintenance Planning and Scheduling Handbook and a Certified Maintenance & Reliability Professional (CMRP) with nearly 25 years of industry experience, pioneered the overhaul of maintenance planning at a major electric utility from 1990 to 1994. His work laid the foundation for expanded planning across all crafts and stations, demonstrating the real‑world impact of effective scheduling.