The accuracy of any cost model depends on how well operational processes are understood and mapped. This question assesses whether your organization has the process foundations needed for reliable cost modelling, or whether gaps in process documentation undermine everything built on top of them.
Time-Driven Activity-Based Costing depends fundamentally on two inputs: the capacity cost rate for each resource pool and the time equations that describe how long each activity takes based on transaction characteristics. If operational processes are not well-defined, the time equations will be inaccurate, and the entire cost model will produce unreliable results regardless of how sophisticated the technology or methodology.
Research on time equation accuracy identifies three sources of error: forty-nine percent comes from incorrect specification of the activities themselves, thirty percent from imprecise time estimates, and twenty-one percent from failure to update equations when processes change. The first two sources are directly addressed by better process design. Time estimation errors alone range from twenty to thirty-five percent in organizations that have not systematically documented their processes.
The practical difference is dramatic. Organizations with well-defined processes can implement TDABC models in as little as three weeks using a rapid prototyping approach. Those without process documentation face implementation timelines of six months or more, because the modelling team must first map and understand the processes before they can build time equations. One implementation documented two hundred fifty time equations across an enterprise, while another found that over ten percent of equations required nine or more terms to capture process complexity. This level of detail is only achievable when operational processes are systematically documented.
Question 11 evaluates the state of your process documentation and its readiness for cost modelling. Each level reflects a fundamentally different starting position for building accurate cost models.
Answer: “We have no formal process mapping or documentation of operational activities.”
Operational knowledge exists only in the heads of experienced employees. There are no process maps, no documented standard operating procedures linked to cost drivers, and no systematic understanding of how activities consume time and resources. Cost models, if they exist at all, use broad assumptions about resource consumption that bear little resemblance to actual operations.
Example from the Health Check: A services firm allocates overhead based on headcount. When asked how long each type of client engagement takes, managers give estimates that vary by fifty percent or more for the same activity. There is no documentation to resolve the disagreements.
Answer: “Some processes are documented but the documentation was not designed for cost modelling purposes.”
Process documentation exists for quality management, compliance, or operational training purposes. However, it lacks the detail needed for cost modelling: no time estimates per activity, no identification of complexity drivers, no mapping of how transaction characteristics affect resource consumption. Adapting existing documentation for costing is possible but requires significant additional work.
Example from the Health Check: A manufacturer has ISO 9001 process documentation for its production lines. The documentation describes process steps and quality checkpoints but does not capture how setup times vary by product type, how batch sizes affect per-unit processing time, or how customization requests add incremental activity time.
Answer: “Key operational processes are mapped with time drivers that enable activity-based cost modelling.”
The most significant operational processes have been mapped specifically for cost modelling. Activities are documented with time estimates that reflect how resource consumption varies based on transaction characteristics. Time drivers such as order type, product complexity, delivery method, and customer requirements are identified and quantified. This provides a solid foundation for TDABC time equations.
Example from the Health Check: A distribution company has mapped its order-to-delivery process with time equations covering order entry, warehouse picking, quality checks, packing, loading, and delivery. Each equation includes terms for order complexity, number of line items, special handling requirements, and delivery distance.
Answer: “All operational processes are fully documented with validated time equations and linked to capacity models for comprehensive cost modelling.”
Every resource-consuming process across the organization is documented with validated time equations. The equations have been built using the systematic six-step construction method, reviewed and approved by operations personnel, and linked to capacity models that distinguish between productive, idle, and standby time. Process changes trigger automatic equation updates. The entire operational reality of the organization is captured in a model that can produce accurate costs for any combination of products, customers, and transactions.
Example from the Health Check: An enterprise with two hundred fifty time equations across all departments can calculate the true cost of any customer order within seconds. When a new product variant is introduced, the time equation for its production process is calibrated through observation within the first week, and the cost model is updated immediately.
| Industry | Typical Level | Key Insight |
|---|---|---|
| Manufacturing | Level 2–3 average | Production processes are often well-documented for quality purposes but lack time driver detail; setup time variation and batch size effects are the critical gaps to address first |
| Healthcare | Level 1–2 average | Clinical processes are complex and highly variable; starting with high-volume procedures and mapping time equations for the top twenty case types typically covers sixty to seventy percent of cost |
| Financial Services | Level 1–2 average | Transaction processing is often well-understood but customer-facing advisory activities lack time documentation; channel-specific process mapping reveals dramatic cost-to-serve differences |
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