Panhellenic EPAL - independent subject foundations common mistakes
Panhellenic EPAL - independent subject foundations · Understand the traps and how to avoid them.
Treating a model calculation as physical operating authorization.
The model omits equipment, legal and practical conditions.
What to do instead
State its classroom scope and obtain actual approved procedures before implementation.
Mixing energy with power.
Rates and totals have different dimensions.
What to do instead
Write units and multiply power by time only under a stated time model.
Using a display’s smallest increment as its accuracy.
Resolution does not measure bias, calibration or total uncertainty.
What to do instead
Read the instrument specification and include relevant uncertainty sources.
Applying a formula outside its stated assumptions.
Memorized expressions can hide geometry, waveform or operating restrictions.
What to do instead
State assumptions and test whether the supplied scenario satisfies them.
Confusing a supplied allowable stress with yield strength.
An allowable limit can incorporate other criteria and margins.
What to do instead
Identify the definition of each stated limit before calculating a ratio.
Ignoring losses in an output calculation.
Ideal input-output relations do not automatically apply to real devices.
What to do instead
Apply the specified efficiency once in the correct direction and check the energy balance.
Comparing lifecycle totals for different services.
Different functional units can make the ranking meaningless.
What to do instead
Normalize the service, boundary and time horizon before comparing impacts.
Reading an obsolete drawing as the current design.
A technically plausible dimension can belong to the wrong revision.
What to do instead
Check drawing identifiers, revision status and linked parts before calculating.
Treating a single good test result as complete approval.
A test samples particular properties under particular conditions.
What to do instead
Match each requirement to the evidence it needs and identify untested conditions.
Rounding intermediate values too early.
Accumulated rounding can change the final comparison.
What to do instead
Retain appropriate guard digits and round at the final reporting precision.