Time and Motion Analysis: The Complete Technical Guide
Time and motion analysis (TMA) is the quantitative measurement of how work is performed — how long each task takes, which motions are used, and how much time is wasted. AI has automated what the stopwatch and clipboard took days to capture.
Historical foundations: from Taylor to AI video
Modern time and motion analysis has two intertwined lineages. Time study (Frederick Winslow Taylor, 1880s) focuses on how long a task takes, using stopwatch measurement to compute standard times. Taylor's work at Bethlehem Steel — famously doubling pig-iron loading rates — established the principle that work could be measured empirically rather than estimated by tradition.
Motion study (Frank and Lillian Gilbreth, 1900s) focuses on which motions are used and eliminates unnecessary ones. The Gilbreths cataloged 18 elemental hand motions called therbligs (their name backwards) — grasp, transport loaded, position, release load, etc. — that still appear in modern predetermined motion time systems. Frank Gilbreth's bricklaying study reduced motions per brick from 18 to 4.5, doubling masonry output. Crucially, the Gilbreths used film cameras for micromotion analysis — the first video-based TMA, a century before AI.
The evolution: 1880 → today
| Era | Method | Limitation |
|---|---|---|
| 1880–1911 | Taylor stopwatch studies | Single analyst, one task at a time |
| 1900–1924 | Gilbreth film micromotion analysis | Film processing cost, manual coding |
| 1948–1972 | MTM-1, MOST | Expert skill required, no video |
| 1990s–2010s | Software-assisted time study | Still required human observers |
| 2020s | AI video TMA (VidForgeX TMA) | Accuracy limits on very short cycles (<5s) |
Predetermined motion time systems
MTM — Methods-Time Measurement
Published in 1948 by H.B. Maynard, MTM-1 decomposes work into basic motions, each with a time value in TMU (Time Measurement Units) where 1 TMU = 0.036 seconds (27.8 TMU = 1 second). Basic motion classes:
- Reach (R) — move hand to object or location; time depends on distance and case (A-E)
- Move (M) — transport object; time depends on distance, weight, and case
- Grasp (G) — gain control of object; 5 cases (G1–G5) from simple pickup to regrasp
- Position (P) — align part for assembly; varies by symmetry and fit clearance
- Release (RL) — relinquish control; RL1 (normal) = 2 TMU, RL2 (contact) = 0 TMU
- Disengage (D) — break contact between parts; force and care determine time
- Eye travel (ET/EF) — move eyes or focus; rarely rate-limiting but counted
- Body/leg motions — walk, turn, bend, sit, stand — each with TMU values
MTM-2 (1965) and MTM-UAS (1980) are higher-level aggregations trading precision for speed. MTM-UAS covers 95% of assembly operations with 4 motion categories and is 7x faster to apply than MTM-1. The International MTM Directorate governs the standards (mtm.org).
MOST — Maynard Operation Sequence Technique
Introduced in 1972, MOST groups motions into three activity sequences:
- General Move — A-B-G-A-B-P-A (free movement through space)
- Controlled Move — A-B-G-M-X-I-A (movement along a controlled path)
- Tool Use — A-B-G-A-B-P-*-A-B-P-A (use of a hand tool)
Each parameter (A=action distance, B=body motion, G=gain control, M=move controlled, X=process time, I=align, P=place) is assigned an index number (0, 1, 3, 6, 10, 16…); the sum × 10 gives TMU. MOST is approximately 5–10x faster to apply than MTM-1 and is the preferred system for one-off studies and continuous improvement work.
Key metrics TMA produces
Cycle time, takt time, and lead time
Cycle time is the actual measured time to complete one complete unit of output. VidForgeX TMA measures this directly from video: detecting the start trigger (e.g., workpiece enters station), running the clock until the completion trigger (workpiece exits), and recording the duration.
Takt time = available production time ÷ customer demand rate. It is the metronome of a production system — the rate at which products must be completed. When cycle time > takt time, you have a bottleneck; when cycle time < takt time, you have capacity slack.
Example: A packing station is available 7.5 hours per shift (27,000 seconds). Daily demand is 900 units. Takt = 27,000 ÷ 900 = 30 seconds. VidForgeX TMA measures average cycle time of 38 seconds. The station is a bottleneck requiring either method improvement or capacity addition.
OEE — Overall Equipment Effectiveness
OEE = Availability × Performance × Quality. World-class is 85%; typical manufacturing runs 40–60%. VidForgeX TMA supplies the Performance component directly: Performance = (Ideal cycle time × actual output) ÷ planned production time. Availability and Quality inputs can be imported from your ERP/MES system for full OEE calculation.
Value-added vs non-value-added activity
Lean manufacturing classifies every motion as:
- Value-added (VA) — directly transforms the product toward what the customer pays for
- Non-value-added but necessary (NNVA) — required by current conditions but creates no value (e.g., walking to a poorly positioned tool)
- Non-value-added (NVA / waste) — pure muda: waiting, searching, rework, unnecessary motion
VidForgeX TMA classifies each detected activity into these categories based on the analysis profile, and visualizes VA/NVA ratios per operator, per station, and per shift.
Idle time and utilization rate
Idle time = periods where an operator is present but not performing productive work. VidForgeX TMA detects idle gaps by monitoring for absence of motion activity above a threshold duration. Utilization rate = (total operating time − idle time) ÷ total operating time × 100%.
TMA across industries
Assembly line cycle time, operator efficiency, station balance, ergonomic risk, changeover (SMED) analysis. VidForgeX TMA feeds directly into production balance charts and OEE dashboards.
Pick-and-pack cycle time, pallet loading efficiency, dock turnaround, travel distance analysis. Identify high-NVA zones for slotting optimization.
Operating room utilization, nursing task analysis (direct vs indirect care), medication administration timing, procedure compliance. Reduces OR idle time and patient wait.
Screen recording analysis: application usage, context switches, meeting vs focus time, workflow adherence. SOP generation from observed processes.
Checkout cycle time, shelf-stocking efficiency, customer service interaction duration, staff deployment vs footfall.
Crew productivity, equipment idle time, safety compliance observation, materials handling efficiency on multi-trade sites.
How VidForgeX TMA works in practice
Traditional TMA requires an industrial engineer to physically observe a workstation for 2–5 days, recording observations by hand or into specialized software, then manually coding activities, computing statistics, and producing a report. A complete study of one workstation typically takes one analyst 3–5 days.
VidForgeX TMA replaces the observation phase with video. Mount a camera at the workstation (or use existing CCTV), upload the footage to tma.vidforgex.com, select the appropriate analysis category, and receive a structured report within minutes covering:
- Per-operator activity timeline with activity classifications and durations
- Cycle time distribution with mean, P90, and standard deviation
- VA / NVA / NNVA breakdown as percentages and absolute minutes
- Idle time events with timestamps and durations
- SOP compliance score if a Rule Template is defined
- Comparative analysis if baseline data exists (targeted mode)
Results export as structured PDF reports, CSV for BI tools, and JSON via the MCP API for integration with existing ERP or manufacturing analytics systems.
TMA integration with lean and Six Sigma
VidForgeX TMA produces data that feeds directly into the most common continuous improvement frameworks:
- Lean / Kaizen — VA/NVA analysis, muda identification, value stream inputs
- Six Sigma DMAIC — Measure phase data (cycle time distribution, Cpk inputs from timing data)
- SMED (Single Minute Exchange of Die) — Changeover activity timing and external/internal operation separation
- 5S audits — Search time and motion waste detection for workplace organization assessment
- Standard work documentation — SOP generation from observed best-practice runs