The Endorsement Standard

The Practical Endorsement is the teacher-assessed practical component of A Level Physics. It is reported separately from the A Level grade, but students must complete it as part of the full A Level course.

The specification sets out the skills in section 1.2.1 and the apparatus and techniques in section 1.2.2. Across the course, each student must carry out a minimum of 12 assessed practical activities and build evidence that they can consistently and routinely meet the Common Practical Assessment Criteria, usually shortened to CPAC.

This matters because a practical activity is not "passed" simply by producing a worksheet at the end. The evidence comes from what the student does during the activity, what they record at the time, and whether they can apply the same habits repeatedly in different practical contexts.

The 1.2.1 skills group into four broad areas:

The crucial phrase is "each student". Practical work can involve discussion and group setup, but your own record and actions must show your own competence.

Independent Thinking And Instructions

Section 1.2.1(a) expects you to apply investigative approaches and methods to practical work. This is broader than following a recipe. It means you can make sensible decisions in a practical context and justify those decisions using physics and measurement ideas.

Independent thinking might include choosing:

• which variable to change and which quantity to measure
• which variables must be controlled
• a suitable range and interval for the independent variable
• apparatus that gives measurements with suitable resolution
• a method that is safe, repeatable and appropriate to the aim
• how to respond if the first set of readings is too small, too scattered or clearly limited by the apparatus

Section 1.2.1(c) then pulls in the complementary skill: following written instructions. A good experimental physicist does both. You follow the safety-critical and method-critical instructions accurately, while still thinking about why each step is there.

Worked example: suppose you are asked to investigate how the measured time for a simple repeatable motion changes when one chosen length is changed. A weak approach is to take one timing for each length and write "repeat for other lengths". A stronger practical plan says:

• independent variable: the length set by the ruler
• dependent variable: the time measured by stopwatch
• control variables: same object, same release method, same timing point
• range: at least five different lengths covering a wide usable range
• repeat measurements: three timings at each length, then calculate a mean
• improvement if timings are short: time several cycles or use a light gate if the setup allows it

The physics details of the motion may be taught later. The endorsement skill here is the ability to design and justify a practical strategy.

Safe And Correct Equipment Use

Section 1.2.1(b) requires safe and correct use of practical equipment and materials. Section 1.2.1(j) requires experience with a wide range of instruments, equipment and techniques appropriate to the physics specification. The detailed apparatus list belongs to section 1.2.2, but the conduct skill is the same in every practical: choose, set up, use, check and put away equipment properly.

A useful risk statement names both parts. "The lamp gets hot" names a hazard. "Handle the lamp holder rather than the bulb and allow it to cool before moving it" explains how the risk is reduced. "Be careful" is not enough for exam-style practical reasoning.

Safe and correct equipment use normally includes:

• checking the apparatus is appropriate for the measurement range
• zeroing, calibrating or checking the instrument where needed
• reading scales without parallax where possible
• using electrical components within safe ratings
• using radiation, lasers, hot objects, springs, glassware, masses and moving objects only with the specified precautions
• keeping liquids, trailing leads and unstable clamps under control
• disposing of or storing equipment and materials as instructed

The phrase "wide range" does not mean you must master every instrument in one lesson. It means that, over the course, your record should show experience of using the different families of physics apparatus: mechanical, electrical, optical, thermal, wave, data-logging and radiation equipment where relevant.

Measurements And Records

Section 1.2.1(d) is about making and recording observations or measurements. Section 1.2.1(e) is about keeping appropriate records of experimental activities. The distinction is useful:

• 1.2.1(d): you personally make observations/measurements and record them as they happen.
• 1.2.1(e): you keep a permanent, interpretable record of the activity.

For quantitative data, record values with units and a sensible number of decimal places. For repeated measurements of the same quantity, keep the decimal places consistent with the instrument. For qualitative observations, use precise scientific vocabulary. "The time was inaccurate" is vague; "manual stopwatch timing introduced reaction-time uncertainty" is specific.

Worked example: a student times 10 oscillations with a stopwatch and records these raw readings:

The mean time for 10 oscillations is:

The readings are to 0.01 s, so a sensible processed value is 12.41 s. The period for one oscillation is:

This record is stronger than writing "period = 1.24 s" alone because it shows the raw data, the repeat strategy, the processing step and the unit.

Do not delete data just because it does not match what you expected. If a reading is anomalous, keep a record of it and state the practical reason for excluding it from processing, such as a timing error, a slipping clamp or a misread scale.

Presentation, Processing And Tools

Section 1.2.1(f) requires information and data to be presented in a scientific way. Section 1.2.1(g) requires appropriate software and tools to process data, carry out research and report findings.

For tables, a strong scientific presentation usually has:

• an informative title if the table is part of a report
• the independent variable in the first column
• raw dependent readings before processed data
• quantity and unit in each column heading, such as time / s
• no units repeated in the body of the table
• raw data recorded to decimal places consistent with the apparatus
• processed data recorded to a sensible number of significant figures

Graphs should use appropriate axes, units, scale and line of best fit where a graph is suitable. A graph is not automatically better than a table: it is useful when it reveals a trend, proportionality, gradient, intercept or anomaly.

This formula is one way to decide whether a measurement strategy is good enough. If the absolute uncertainty is fixed, a larger measured value gives a smaller percentage uncertainty.

Worked example: a stopwatch timing has an estimated reaction-time uncertainty of 0.2 s.

For one event measured as 1.6 s:

If the student times 10 repeated cycles as 16.0 s:

The second strategy has a much smaller percentage uncertainty because the same timing uncertainty is spread over a longer measured interval.

Software and tools should be chosen for a reason. A spreadsheet can calculate means, add processed columns and plot graphs from large datasets. A data logger can collect rapid or long-duration data more consistently than a person reading a stopwatch. A word processor or presentation package can help report findings. If an AI tool is used, it must be used with meaningful student input and cited as a tool; it cannot replace the student's own practical reasoning.

Research, Referencing And Reporting

Section 1.2.1(h) requires online and offline research skills. Section 1.2.1(i) requires correct citation of sources. In practical physics, research is not just background decoration. It can help you find safe handling advice, accepted values, possible methods, apparatus limitations, or theory that supports the design of an investigation.

Good practical research uses sources fit for the job:

• safety: CLEAPSS Student Safety Sheets, safety data sheets or local safety guidance
• specification or assessment boundaries: official documents
• method ideas: textbooks, teacher-approved practical resources or institutional sources
• accepted values: data books, reputable institutions or scientific references
• wider background: textbooks, review articles or carefully checked web sources

The Practical Endorsement does not require one specific referencing system. What matters is that your references are complete and consistent. For a website, include the author or organisation where available, the year, the title, the fact that it is online, the access date and the URL. If no publication year is available, OCR's guidance uses the year in which the information was sourced.

Example website reference:

Cambridge OCR (2026), Practical Skills Handbook - GCE Physics. [online] Last accessed 2026-05-08: https://www.ocr.org.uk/Images/295483-practical-skills-handbook.pdf

Reporting findings is the final connection between practical skill and physics understanding. A strong report separates raw observations from processed results, explains how the data were processed, identifies uncertainty or limitations, and makes a conclusion that is supported by the evidence.

That same standard applies when a report uses researched information: the reader should be able to trace where the information came from.

Research, Referencing And Reporting Continued

By the end of this lesson, the practical endorsement standard should feel less mysterious. A pass-ready student thinks independently, follows instructions, works safely, uses equipment correctly, records measurements at the time, presents and processes data scientifically, uses appropriate tools, researches carefully, cites sources, and builds evidence across the whole course.

Explain It Back

Use this as a self-explanation check after the section above. It is for diagnosing what you can already explain, not for learning new material from scratch.