Why English? | Reading a Safety Data Sheet Before Laboratory Work

A Safety Data Sheet is not background reading for someone else. It is a structured hazard-communication document that connects a specific chemical product to safe handling, protective equipment, first aid, spill response, storage and emergency decisions.

English matters because the sheet uses conditional language, technical nouns and distinctions that change action: vapour is not dust, incompatible is not merely undesirable, and may cause is not permission to ignore a hazard. The reader must connect the right section to the task under supervision.

Singapore’s Workplace Safety and Health Council explains that the Globally Harmonised System uses standardised classification, labels and Safety Data Sheets. Its guidance lists sixteen SDS sections. MOM also states that an SDS must be reviewed within five years of issue and when new information or a change in chemical properties arises.

A five-minute orientation

This Reading a Safety Data Sheet Before Laboratory Work guide is for students and early-career learners who need to connect chemical language to supervised laboratory action. Read straight through once, then return to the section that matches the decision in front of you.

For reading a safety data sheet before laboratory work, use a four-column note: exact words, what they refer to, action required, and question still open. This prevents a polished summary from erasing a deadline, exception or named document.

Did You Know? In reading a safety data sheet before laboratory work, administrative English often carries decisive meaning in connectors such as *and*, *or*, *unless*, *subject to* and *before*. Circle them to see whether conditions accumulate, offer alternatives, create exceptions or set order.

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What current official sources establish

The factual floor for this article comes from WSH Council GHS overview, MOM SDS review-period guidance, WSH Council preventing chemical hazards, WSH Council chemicals resources. These sources were checked on 21 October 2026. Cycle-sensitive details are dated in the text, and readers should revisit the live source before acting.

The official sources answer the policy or safety questions behind reading a safety data sheet before laboratory work; this article teaches the reading process. Where a personal document or controlled record differs from a general explanation, pause and use the source issued for the case.

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1. Start with the exact product

An SDS belongs to a named product, supplier and formulation. Similar chemical names or different concentrations may have different hazards and controls.

A practical example

A student who finds an SDS for concentrated hydrochloric acid cannot assume it represents a dilute classroom solution. Match the container label, concentration where given, supplier and product identifier.

Turn the language into action

• Read Section 1 identification.
• Match the label to the sheet.
• Check supplier and emergency contact.
• Stop if the product identity is uncertain.

Did You Know? For Start with the exact product, a reliable reader can connect the next move—read section 1 identification.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Never substitute an internet sheet merely because the chemical name looks close.

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2. Check issue date and revision

A technically accurate sheet can become outdated when classifications or product information change. The date is part of the safety evidence.

A practical example

MOM’s current FAQ says the SDS must be reviewed within five years of issue and when new information or chemical properties change. A laboratory should still follow its own document-control process.

Turn the language into action

• Find issue and revision dates.
• Use the controlled laboratory copy.
• Replace superseded sheets.
• Report missing or unreadable dates.

Did You Know? For Check issue date and revision, a reliable reader can connect the next move—find issue and revision dates.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Five years is a review requirement, not a promise that every sheet remains current for exactly five years.

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3. Read hazards before procedure steps

Section 2 tells the reader how the product is classified and communicates hazards through statements, signal words and pictograms. It frames every later instruction.

A practical example

If the sheet identifies corrosive and inhalation hazards, a procedure that mentions only measuring volume is incomplete as a safety plan. The hazard language determines controls and supervision.

Turn the language into action

• Identify classifications.
• Read every hazard statement.
• Match pictograms to meanings.
• Note precautionary statements.

Did You Know? For Read hazards before procedure steps, a reliable reader can connect the next move—identify classifications.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

A pictogram alone is not the whole hazard description. Read the accompanying words.

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4. Use composition to understand mixtures

Section 3 identifies ingredients and concentration information within the rules that apply to the sheet. This helps explain why a mixture behaves differently from a pure substance.

A practical example

Two cleaning products with similar trade names may contain different active ingredients. The composition section prevents brand familiarity from replacing chemical identity.

Turn the language into action

• Distinguish substance from mixture.
• Note hazardous ingredients.
• Record concentration ranges where given.
• Avoid guessing undisclosed composition.

Did You Know? For Use composition to understand mixtures, a reliable reader can connect the next move—distinguish substance from mixture.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Students should not reverse-engineer or experiment with a formulation from an SDS. Use the information for safe interpretation.

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5. Read first aid by exposure route

Section 4 separates inhalation, skin contact, eye contact and ingestion because the correct response depends on how exposure occurred.

A practical example

The vague instruction “wash it off” may be inadequate for eye exposure or inhalation. Before work begins, locate the route-specific first-aid directions and know how to summon trained help.

Turn the language into action

• Locate every relevant route.
• Identify immediate actions.
• Note symptoms needing attention.
• Know the laboratory emergency process.

Did You Know? For Read first aid by exposure route, a reliable reader can connect the next move—locate every relevant route.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

An SDS does not replace trained medical advice or the laboratory’s emergency procedure.

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6. Find firefighting information without becoming the firefighter

Section 5 describes suitable extinguishing media, specific hazards and protective advice for responders. Students read it to understand risk and evacuation, not to improvise emergency response.

A practical example

A small flame can involve vapours, decomposition products or unsuitable extinguishing methods. The correct student action is normally to alert the supervisor and follow the emergency plan.

Turn the language into action

• Identify flammability information.
• Note unsuitable media.
• Know alarm and evacuation routes.
• Leave response to trained personnel.

Did You Know? For Find firefighting information without becoming the firefighter, a reliable reader can connect the next move—identify flammability information.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Reading competence should increase caution, not create false confidence.

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7. Plan spill response before a spill

Section 6 covers accidental release measures, including personal precautions, environmental precautions and containment or cleanup information.

A practical example

A dropped bottle is not simply a mess. The language may distinguish evacuation, ventilation, specialised absorbent and waste handling. Preparation means knowing whom to tell immediately.

Turn the language into action

• Read personal precautions.
• Identify isolation or ventilation needs.
• Locate the authorised spill kit.
• Know the reporting route.

Did You Know? For Plan spill response before a spill, a reliable reader can connect the next move—read personal precautions.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Do not clean a spill unless trained, authorised and equipped for that material and quantity.

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8. Translate handling verbs into laboratory behaviour

Section 7 uses verbs such as avoid, keep, prevent, use and store. Each should become an observable action at the bench.

A practical example

“Avoid breathing vapours” is not satisfied by promising to be careful. It points toward task design, ventilation and exposure controls described elsewhere.

Turn the language into action

• Underline action verbs.
• Connect each verb to a control.
• Confirm storage conditions.
• Check incompatibilities.

Did You Know? For Translate handling verbs into laboratory behaviour, a reliable reader can connect the next move—underline action verbs.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Personal care cannot compensate for missing engineering controls or supervision.

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9. Read PPE as part of a control system

Section 8 covers exposure controls and personal protection. Gloves, eye protection and respiratory protection must suit the specific hazard and task.

A practical example

The word gloves is not a universal solution. Material compatibility, breakthrough, fit and contamination procedures matter. Students should use the PPE selected by the laboratory’s risk assessment.

Turn the language into action

• Read exposure controls first.
• Identify specified protection.
• Check fit and condition.
• Follow removal and disposal steps.

Did You Know? For Read PPE as part of a control system, a reliable reader can connect the next move—read exposure controls first.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Do not choose respirators or chemical-resistant gloves from a general article.

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10. Use physical properties to recognise change

Section 9 may describe appearance, odour, pH, flash point and other properties. These details support hazard recognition and process planning.

A practical example

An unexpected colour, phase or odour can indicate contamination or decomposition, but smelling a chemical deliberately is not a checking method. Report the discrepancy.

Turn the language into action

• Know expected appearance.
• Read relevant temperature data.
• Note volatility or flammability clues.
• Report unexpected properties.

Did You Know? For Use physical properties to recognise change, a reliable reader can connect the next move—know expected appearance.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Physical properties assist recognition; they do not authorise sensory testing.

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11. Read stability and incompatibility as relationships

Section 10 explains conditions to avoid, incompatible materials and hazardous decomposition. The meaning lies in relationships between substances, temperature, light, pressure and storage.

A practical example

Two individually familiar reagents can become dangerous together. A storage shelf organised only by alphabet may place incompatible chemicals side by side.

Turn the language into action

• List conditions to avoid.
• List incompatible materials.
• Check storage segregation.
• Review the planned reaction.

Did You Know? For Read stability and incompatibility as relationships, a reliable reader can connect the next move—list conditions to avoid.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Do not test compatibility by mixing small amounts. Use approved information and supervision.

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12. Understand toxicological language without panic

Section 11 describes routes, effects and toxicological information. Terms such as acute, chronic, sensitisation and target-organ effects refer to different patterns of harm.

A practical example

A student may see a severe word and either panic or dismiss it as legal boilerplate. Better reading asks which route and duration are relevant, then follows the controls.

Turn the language into action

• Separate acute from chronic.
• Identify likely routes.
• Note immediate and delayed effects.
• Connect findings to controls.

Did You Know? For Understand toxicological language without panic, a reliable reader can connect the next move—separate acute from chronic.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

An SDS supports risk management; it is not a personal medical diagnosis.

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13. Read the environmental and disposal sections

Sections 12 and 13 cover ecological information and disposal considerations. Laboratory waste is not ordinary rubbish merely because the experiment used a small quantity.

A practical example

Pouring a leftover solution down a sink can move a hazard into plumbing or the environment. Follow the institution’s labelled waste stream and supervisor instructions.

Turn the language into action

• Identify environmental hazards.
• Use designated waste containers.
• Keep incompatible wastes separate.
• Label and close containers correctly.

Did You Know? For Read the environmental and disposal sections, a reliable reader can connect the next move—identify environmental hazards.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Local rules and institutional procedures determine disposal. Do not improvise from a generic summary.

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14. Keep transport and workplace use distinct

Section 14 addresses transport information, while Section 15 covers regulatory information. These sections explain broader controls but do not replace the laboratory’s task-specific risk assessment.

A practical example

A product may have transport classifications that matter to shipping staff while a student’s immediate duty concerns handling under supervision. Both are real, but they answer different questions.

Turn the language into action

• Recognise section purpose.
• Escalate transport questions.
• Follow institutional procurement rules.
• Do not mail or carry chemicals casually.

Did You Know? For Keep transport and workplace use distinct, a reliable reader can connect the next move—recognise section purpose.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Possessing an SDS is not permission to transport a substance.

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15. Use Section 16 to trace meaning

The final section may contain revision information, abbreviations, sources or other details that help interpret the sheet.

A practical example

If a hazard statement changed between versions, the revision note can explain why procedures need review. Abbreviations should be expanded before being copied into student notes.

Turn the language into action

• Check revision history.
• Expand abbreviations.
• Record the source version.
• Update linked procedures when required.

Did You Know? For Use Section 16 to trace meaning, a reliable reader can connect the next move—check revision history.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Section 16 does not make earlier sections optional; it helps the reader audit them.

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16. Connect SDS reading to the risk assessment

The WSH Council states that workplaces should conduct risk assessment, maintain safe work procedures, provide training and communicate chemical hazards. The SDS supplies information; the risk assessment applies it to the actual task.

A practical example

The same chemical may be used in a sealed demonstration, a heated reaction or a transfer. Quantity, temperature, equipment and people change the risk even when the SDS stays the same.

Turn the language into action

• Read the task risk assessment.
• Compare it with SDS hazards.
• Identify required controls.
• Ask the supervisor about discrepancies.

Did You Know? For Connect SDS reading to the risk assessment, a reliable reader can connect the next move—read the task risk assessment.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

An SDS alone cannot decide whether a particular experiment is acceptable.

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17. Practise an emergency explanation

In an incident, clear English should identify product, exposure route, location, amount if known, symptoms and actions already taken. Precision helps trained responders act.

A practical example

“Something spilled” is less useful than “A labelled bottle of Product X spilled near bench three; one student may have skin contact; the supervisor has been alerted.” Speak only to facts you know.

Turn the language into action

• Name the product.
• State the exposure or spill route.
• Give the location.
• Avoid invented certainty.

Did You Know? For Practise an emergency explanation, a reliable reader can connect the next move—name the product.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

Do not delay evacuation or first aid to produce a perfect sentence.

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18. Keep the student role properly bounded

Students read SDSs to recognise hazards, follow procedures and ask better questions. Teachers, technicians and employers retain responsibilities for risk assessment, training, supervision and controls.

A practical example

A capable student who notices a mismatch should stop and raise it. That is responsible science, not insubordination or weakness.

Turn the language into action

• Ask before handling.
• Report missing labels.
• Stop when identity is uncertain.
• Follow trained supervision.

Did You Know? For Keep the student role properly bounded, a reliable reader can connect the next move—ask before handling.—to an exact noun, verb, date, condition or source. “I think it means” becomes a checkable explanation supported by the document.

Keep the boundary clear

English is a safety tool, not a licence to perform unsupervised chemical work.

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Applied reading workshops

These exercises turn the document into practice without replacing the official source, institutional process or trained supervision.

Trace one hazard across the sheet

Choose one hazard from Section 2 and follow it through first aid, handling, exposure controls, stability and disposal. This reveals how an SDS works as a connected system rather than sixteen unrelated boxes.

Write the chain in action language: hazard identified, exposure prevented, response prepared, incompatible condition avoided and waste controlled. Have a supervisor check the interpretation before laboratory work.

Compare label and SDS

Place the container label beside the corresponding SDS. Match product identifier, pictograms, signal word and supplier information. The label supports immediate recognition; the SDS supplies deeper detail.

If the label is missing, damaged or inconsistent, stop and report it. Do not repair meaning from memory or transfer material into an unlabelled container.

Practise route-specific first aid reading

Create four headings: inhalation, skin, eyes and ingestion. Copy only the exact response language relevant to the product, then compare it with the laboratory emergency procedure.

The exercise shows why a generic sentence such as rinse and continue is unsafe. In a real event, alert trained help and follow the authorised process.

Audit a glove assumption

Find what Section 8 says about protection and compare it with the gloves provided for the task. Ask the supervisor how compatibility, concentration, contact time and disposal were considered.

Do not turn the exercise into independent PPE selection. Its purpose is to connect document language to the laboratory’s risk assessment and to expose unanswered questions.

Map incompatibilities

From Section 10, list conditions and materials to avoid. Compare them with the planned reaction, storage cabinet and waste stream. Relationships matter more than memorising isolated chemical names.

If the procedure seems to contradict the sheet, stop and escalate. The discrepancy may reflect a controlled method, a different concentration or an error; a student should not decide silently.

Run a spill communication drill

Without touching any material, practise reporting a fictional spill: exact product, location, approximate quantity if known, exposure status and actions already taken. Keep uncertainty explicit.

The drill builds language that helps trained responders while reinforcing the student’s boundary: alert, isolate if instructed and follow the emergency plan rather than improvising cleanup.

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A parent–student or mentor–learner plan

For reading a safety data sheet before laboratory work, first let the learner read alone and mark uncertainty without embarrassment. Then ask for an ordinary-language explanation while the adult checks names, dates, money, safety or logistics. Compare it with the source line by line and turn only verified points into actions.

When supporting students and early-career learners who need to connect chemical language to supervised laboratory action, the adult’s role is not to seize the document and produce an answer the learner cannot later use. Shared understanding is stronger: the learner owns the decision, the adult notices risks, and both know when an authority or trained professional must answer.

A useful closing question for reading a safety data sheet before laboratory work is: What would make us reopen this document? A changed date, revised source, different course, altered venue, new product or unexpected request can trigger a fresh read.

For students and early-career learners who need to connect chemical language to supervised laboratory action, accuracy is a generous habit. It protects the learner, the family, the institution, future colleagues and anyone who must rely on the record later.

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Student checklist

• I can name the document and its issuing authority.

• I have checked the date, version and whether it applies to me.

• I can distinguish facts, conditions, examples and advice.

• I have converted each important instruction into an action with an owner.

• I have saved the source and any confirmation securely.

• I know which questions require an official or trained answer.

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Frequently asked questions

What is an SDS?

A Safety Data Sheet is a structured document containing product identity, hazards, precautions, first aid, handling, storage and other safety information.

How many sections does it have?

Singapore WSH guidance lists sixteen standard sections under the GHS-aligned format.

Can I use an SDS for a similar product?

No. Match the exact product, supplier and formulation or concentration where applicable.

How current should it be?

MOM says an SDS must be reviewed within five years of issue and whenever new information or a change in chemical properties arises.

Does reading the SDS mean I can handle the chemical?

No. Handling also requires an approved task, risk assessment, controls, training and supervision.

Which sections matter in an emergency?

That depends on the event, but hazard identification, first aid, firefighting and accidental-release sections are common starting points for trained response.

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Useful next reading

• Explain scientific evidence clearly
• Learn how English instructions work
• Use the complete English learning map

English matters in reading a safety data sheet before laboratory work because reading is not finished when the eyes reach the last line. It is finished when the right person understands the right condition, takes the right action, preserves the evidence and knows when to ask for help.

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A final evidence-to-action exercise

Choose the five lines in this reading a safety data sheet before laboratory work document that would cause the greatest harm if misunderstood. For each line, identify the actor, action, object, condition, deadline and evidence of completion. Then write one sentence explaining what the line does not say. This negative check prevents the reader from adding permission, certainty or scope that the source never supplied.

Begin with the themes Start with the exact product, Check issue date and revision, Read hazards before procedure steps. Put the exact source words in the left column and your proposed action in the right. Between them, add a narrow evidence column that names the clause, row, section, message or controlled record supporting the action. If the evidence cell is blank, the action is still an assumption.

For reading a safety data sheet before laboratory work, now read the action column as if you were the person who must carry it out tomorrow. Replace vague verbs such as handle, sort, check or deal with by observable verbs: open, compare, confirm, upload, report, stop, ask or retain. Add the owner, timing and authorised channel. This is how English moves from recognition to execution.

Finally, ask a second reader to challenge the scope of reading a safety data sheet before laboratory work. Does a sentence apply to every candidate, only one recipient, one product, one paper or one stage of recruitment? Does a general webpage answer the personal case, or must an issued document or trained authority decide? Record the boundary beside the action.

Read your reading a safety data sheet before laboratory work explanation aloud to someone unfamiliar with the source. If that person cannot tell who must act, what must happen next, which evidence controls and what remains uncertain, revise it. If the missing detail is not in the document, do not invent it; turn it into a precise question for WSH Council GHS overview or the appropriate issuing authority.

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Eight checkpoint rehearsals

Checkpoint 1: Start with the exact product

Return to the exact source language for start with the exact product and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For start with the exact product, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Never substitute an internet sheet merely because the chemical name looks close. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 2: Check issue date and revision

Return to the exact source language for check issue date and revision and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For check issue date and revision, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Five years is a review requirement, not a promise that every sheet remains current for exactly five years. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 3: Read hazards before procedure steps

Return to the exact source language for read hazards before procedure steps and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For read hazards before procedure steps, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: A pictogram alone is not the whole hazard description. Read the accompanying words. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 4: Use composition to understand mixtures

Return to the exact source language for use composition to understand mixtures and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For use composition to understand mixtures, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Students should not reverse-engineer or experiment with a formulation from an SDS. Use the information for safe interpretation. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 5: Read first aid by exposure route

Return to the exact source language for read first aid by exposure route and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For read first aid by exposure route, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: An SDS does not replace trained medical advice or the laboratory’s emergency procedure. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 6: Find firefighting information without becoming the firefighter

Return to the exact source language for find firefighting information without becoming the firefighter and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For find firefighting information without becoming the firefighter, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Reading competence should increase caution, not create false confidence. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 7: Plan spill response before a spill

Return to the exact source language for plan spill response before a spill and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For plan spill response before a spill, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Do not clean a spill unless trained, authorised and equipped for that material and quantity. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

Checkpoint 8: Translate handling verbs into laboratory behaviour

Return to the exact source language for translate handling verbs into laboratory behaviour and explain why that checkpoint matters in this reading a safety data sheet before laboratory work decision. Point to the controlling noun, verb, condition, date or identity field. Then describe one plausible error a hurried reader could make and its consequence.

For translate handling verbs into laboratory behaviour, write the next action in a complete sentence with an owner, timing and evidence of completion. Compare it with this boundary: Personal care cannot compensate for missing engineering controls or supervision. If the action crosses that boundary, replace it with a question or escalation to the issuing authority. Finish by recording which source you checked and when.

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