lesson
Report what is known and preserve evidence
1 · Learn
When a system behaves unexpectedly, record the symptom, time, affected scope and non-sensitive evidence. Distinguish confirmed facts from hypotheses. Avoid destructive repair attempts before understanding the state and recovery options.
A useful report does not include passwords or private records. It explains what was tested, what changed and what remains uncertain so another person can act safely.
2 · Worked example
'The service did not answer on its local port at 10:05' is an observation. 'The database is destroyed' is not established by that observation alone.
3 · Your turn
Why should a connection failure not be reported as confirmed data loss without further evidence?
Check your answer
Several causes can prevent a connection; the symptom alone does not establish the condition of stored data.
4 · Apply your learning
Write a short incident report from fictional logs, marking each statement as observation or hypothesis.
Adult guidance and safety
Use an approved sandbox, invented data and test accounts. Do not probe other systems or expose credentials. Retain test evidence and accessibility checks; these teaching models are not a completed practical project or a specified GCSE qualification.
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Check a calculation · Year 5 onward
Use this only when your teacher or adult allows a calculator for the task. Show your thinking first. It does not replace mental or written arithmetic and does not mark your lesson answer.
Powers, roots and trigonometry · Year 7 onward
Use only when the task allows a calculator. Choose one operation at a time and record your working. Trigonometry here always uses degrees (DEG), not radians. Inverse sine, cosine and tangent return an angle, not a reciprocal. Keep exact fractions and π in answers when requested.
Approximate numerical results use up to 12 significant digits. Inverse sine returns −90° to 90°, inverse cosine 0° to 180°, and inverse tangent −90° to 90°; these are principal values, not every possible solution of a trigonometric equation.
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