Question 1 of 4: Manual Materials Handling Training Guide and Video for a Courier Service

Question 1: Manual Materials Handling Training Guide and Video for a Courier Service (40 marks: a–10, b–10, c–20)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

(a) Recommended Weight Limit by Package Size and Twist Angle

Given. Hand/carry height $V=50\ \text{cm}$; the courier must also pick packages up from the floor at the sender location, so the origin lift travels $D=|50-0|=50\ \text{cm}$ vertically; two package shapes – a $30\times30\times30\ \text{cm}$ cube box and a $25\ \text{cm}$-diameter, $40\ \text{cm}$-tall cylindrical bag; the target Lifting Index is fixed at $LI=1.0$; load constant $LC=23\ \text{kg}$.

Find. $RWL$ (which, since $LI=L/RWL$ is fixed at $1.0$, is also the maximum recommended package weight $L$) for each package shape at each twist angle.

Approach. Read $HM$, $VM$, $DM$, $FM$ and $CM$ from the exam's own Tables 1–3, 5 and 7 for the fixed geometry, read $AM$ from Table 4 at each of the three twist angles, then evaluate $RWL=LC\times HM\times VM\times DM\times AM\times FM\times CM$ for both packages; because $LI$ is set to $1.0$, each $RWL$ value is directly the recommended weight limit for that package/angle combination.

1. Fixed multipliers (both packages). $H\le 25\ \text{cm}$ for both shapes (15 cm and 12.5 cm) $\Rightarrow HM=1.00$. $V=50\ \text{cm}\Rightarrow VM=0.93$ (Table 2). $D=50\ \text{cm}\Rightarrow DM=0.86$ (Table 3). $F\le0.2/\text{min}\Rightarrow FM=1.00$ (Table 5).
2. Asymmetric multiplier by twist angle (Table 4). $0^{\circ}\Rightarrow AM=1.00$; $45^{\circ}\Rightarrow AM=0.86$; $90^{\circ}\Rightarrow AM=0.71$.
3. Box ($CM=0.95$, Fair). $$RWL_{\text{box}} = 23\times1.00\times0.93\times0.86\times AM\times1.00\times0.95 = 17.48\,AM\ \text{kg}$$ giving $\boxed{17.48\ \text{kg}}$ at $0^{\circ}$, $15.03\ \text{kg}$ at $45^{\circ}$, and $12.41\ \text{kg}$ at $90^{\circ}$.
4. Bag ($CM=0.90$, Poor). $$RWL_{\text{bag}} = 23\times1.00\times0.93\times0.86\times AM\times1.00\times0.90 = 16.56\,AM\ \text{kg}$$ giving $\boxed{16.56\ \text{kg}}$ at $0^{\circ}$, $14.24\ \text{kg}$ at $45^{\circ}$, and $11.75\ \text{kg}$ at $90^{\circ}$.

Because $HM=1.00$ for both shapes once held close to the body, package geometry alone does not restrict the recommended weight here – the real design lever the training guide should teach is keep the load against the torso and face the seat/floor squarely rather than twisting: every $45^{\circ}$ of avoidable twist costs 14–16% of the recommended weight limit, and a full $90^{\circ}$ twist costs nearly 30%.

(b) Fatigue-Reduction Guidelines

The task combines three distinct physical demands – intermittent lifting, sustained walking (up to 1 km round trip per stop), and travel-system transitions (stairs, standing on moving vehicles) – so fatigue guidance must address all three rather than only the lifting component already analyzed in part (a).

• Pacing and micro-breaks. Build short (30–60 s) rest/shoulder-swap breaks into the route between stops rather than lifting/carrying continuously for the full 500 m walk, and schedule heavier or more frequent delivery routes earlier in a shift, before cumulative fatigue degrades lifting technique.
• Load and carry technique. Alternate carrying side/shoulder regularly, use a properly fitted courier bag or two-handed carry (evenly loading both sides of the body) instead of a single-side sling wherever the package shape allows it, and keep the load close to the body (part a) to minimize the static muscular effort of holding it away from the torso over a sustained carry.
• Footwear and walking surface awareness. Require supportive, slip-resistant footwear given variable terrain (sidewalks, stairs, transit-platform gaps) and route couriers away from unnecessarily long walks when a closer stop exists, since walking distance directly multiplies cumulative fatigue exposure across a shift.
• Hydration, weather and thermal load. Provide guidance on hydration and weather-appropriate clothing, since exertion combined with heat or cold materially accelerates fatigue onset during sustained outdoor walking.
• Work-rest and shift scheduling. Cap continuous walking/carrying time before a mandated break, and rotate couriers between higher-exertion (multi-package, longer-walk) and lower-exertion routes across a shift or week rather than assigning the same high-demand route continuously.
• Self-monitoring and reporting. Train couriers to recognize early fatigue/discomfort signals (grip fatigue, low-back ache) and to report them, so a route or load can be adjusted before a minor strain becomes an injury – the same early-reporting principle used in the MSD-prevention program of Question 2.

(c) Training Guide Structure and Video Storyboards

Table of contents – elements to include in the training guide.

1. Introduction: purpose of the guide and the courier's own stake in it (injury prevention, fewer missed shifts).
2. Overview of the job cycle: pickup → carry to stop → transit boarding/transfer (incl. stairs) → carry to delivery → drop-off, so trainees see where each technique applies within their actual route.
3. Safe lifting fundamentals: bend the knees, keep the load close to the body ($H\le25$ cm), keep the back neutral, and avoid twisting the trunk while lifting (Question 1a – every $45^{\circ}$ of twist costs real capacity).
4. Package-specific handling: gripping technique for a boxed vs. a soft-sided/bagged package, and what to do when no handle is present (Poor coupling – grip closer to the base, use both hands).
5. Twist-free transfer technique: how to place a package on a seat and retrieve it again by re-orienting the feet/whole body toward the seat rather than twisting the trunk (directly targets the $AM$ penalty quantified in part a).
6. Transit-specific hazards: stair carrying technique (two-handed grip, clear sightline over/around the package), safely bracing while standing on a moving vehicle, and doorway/gap clearances.
7. Fatigue management: pacing, load-side alternation, and the work-rest guidance from part (b).
8. Recognizing and reporting strain: early symptoms, who to report to, and that reporting is non-punitive.
9. Quick-reference summary card (laminated, pocket-sized): the load-close/no-twist/bend-the-knees cues as a single-page take-away.

Use of video. Video is used where a static image or text cannot convey motion and timing – body posture through the lift, the twist-free re-orientation footwork, and the transition onto/off a moving vehicle – each demonstrated once in real time and once slowed down, filmed from a angle that shows the trainee's whole body (not just hands), with an on-screen caption naming the technique cue at each keyframe. Two segments are storyboarded below: Segment A (lift, carry and stair technique) and Segment B (twist-free transfer, fatigue pacing and drop-off).