Types of Evaluation and the Evaluation Process in Development Programs

Every extension and development programme, whether it is teaching farmers a new irrigation technique or running a nutrition awareness drive in villages, eventually reaches a point where someone asks: did it actually work? That question is what evaluation answers. It is not a one-time report card at the end of a project. It is a structured way of judging worth, spotting weak links, and deciding what to do next. Understanding its types and its process is essential for anyone working in extension education, monitoring and evaluation, or rural development.

Why evaluation is central to extension and development work 🔗

Extension programmes exist to change behaviour, whether that is adoption of a farming technique, a health practice, or a livelihood skill. Simply running activities and hoping for results is not enough. Evaluation is what tells programme managers whether the training, demonstrations, or campaigns actually produced the intended change, and it does so by comparing what has happened against what was planned. Extension specialists have long argued that evaluation should not be confused with plain measurement or record-keeping. It is a judgement process built on evidence, criteria, and comparison, which is what makes it useful for improving future work rather than just documenting the past, as outlined in agricultural extension teaching material from India.

Types of evaluation 🔗

Evaluation is generally classified along two dimensions: when it happens during the life of a programme, and who conducts it. This gives us four commonly used types.

Formative evaluation 🔗

Formative evaluation takes place while a programme is still being implemented. Its purpose is improvement, not final judgement. Data is collected early and analysed quickly so that course corrections can be made before it is too late. In agricultural extension, this could mean checking midway through a season whether farmers are actually applying a recommended practice, and adjusting the training approach if they are not. The FAO’s guidance on evaluating extension programmes describes this purpose clearly: results feed back into the programme while it is still taking shape, so that strengths and limitations can be addressed immediately rather than discovered too late.

Summative evaluation 🔗

Summative evaluation happens at the end of a programme or a defined phase. Instead of asking how to improve things mid-course, it asks what was ultimately achieved. Funding agencies commonly require summative evaluation because it tells them whether the resources produced the promised outcomes, and whether the programme deserves continuation, scaling up, or closure. Where formative evaluation is a diagnostic tool used internally, summative evaluation often produces a final report meant for an external audience such as a donor, government department, or policy body.

Internal evaluation 🔗

An internal evaluation is carried out by people within the organisation running the programme, such as project staff or an in-house monitoring unit. The advantage is familiarity. Internal evaluators already understand the context, the community, and the programme’s history, which usually makes internal evaluation cheaper and faster to organise. The trade-off is a risk of bias, since staff evaluating their own work may unintentionally present it in a favourable light, and internal teams can also be stretched thin trying to run an evaluation alongside their regular duties, as noted in this comparison of internal and external evaluation approaches.

External evaluation 🔗

An external evaluation is conducted by an independent person or agency with no stake in the programme’s outcome. This distance is exactly what gives it credibility. Donors and government bodies often insist on external evaluation for large development projects because it is seen as more objective and less likely to be influenced by organisational pressure to show success. External evaluators also bring specialised technical expertise gathered from working across many different projects, which is particularly useful when a programme uses an innovative or complex intervention model, as explained in this overview of the benefits of external evaluation for development projects. In practice, many large programmes combine both: internal monitoring throughout implementation, backed by a periodic external evaluation for accountability.

The process of evaluation: from description to final judgement 🔗

Beyond types, evaluation also follows a logical sequence of stages. This sequence moves from simply describing a situation to making a final value judgement about it, and each stage builds on the one before it.

Description 🔗

Every evaluation starts with description. Before you can judge whether a programme has worked, you need a clear, factual account of what the programme actually is: its objectives, target group, activities, and the situation it was designed to address. Description sets the baseline. Without an accurate picture of the starting situation and stated goals, any later judgement about progress has nothing solid to be compared against.

Measurement 🔗

Measurement is the stage where numbers and observable indicators enter the picture. It involves assigning values to specific attributes using a defined scale or tool, for example the number of farmers who attended a training, the change in crop yield, or the percentage increase in a community’s awareness of a health practice. Measurement on its own does not tell you whether something is good or bad. It simply produces data. As educational measurement literature puts it, measurement is the tool used within both assessment and evaluation, and you cannot meaningfully assess or evaluate without first measuring, a relationship well summarised in this explanation of how measurement, assessment, and evaluation connect.

Assessment 🔗

Once data has been measured, assessment compares that data against the stated objectives or standards. This is where the question shifts from “what happened” to “how does this compare to what we wanted to happen.” Assessment checks progress against a specific benchmark, such as whether the target number of farmers actually adopted the new seed variety, or whether the training met its planned coverage. Assessment is narrower than full evaluation because it usually focuses on a single objective or component rather than the overall worth of the programme.

Final evaluation 🔗

The final stage draws description, measurement, and assessment together into an overall judgement of value. This is where the programme’s worth, relevance, and impact are weighed, and where a decision is made about what should happen next, whether that is continuing the programme as it is, modifying its design, scaling it up, or discontinuing it. Evaluation at this stage is inherently a value-based judgement, not a neutral summary of data, since it asks whether the results were good enough given the resources spent and the needs of the target community.

How to conduct an effective evaluation 🔗

A good evaluation does not happen by accident. A few practices consistently separate useful evaluations from ones that gather dust in a filing cabinet.

Start with clear objectives 🔗

Vague goals produce vague evaluations. Objectives should be specific enough that success or failure against them is observable, whether that is a target number of beneficiaries, a percentage change in a practice, or a measurable improvement in income or yield.

Identify indicators before the programme begins 🔗

Deciding what evidence will count as success should happen at the planning stage, not after the programme has ended. This avoids the trap of retrofitting indicators to match whatever data happens to be available, a point emphasised in guidance on evaluation and impact assessment of extension programmes, which stresses identifying beneficiaries and the specific behavioural evidence required well before implementation.

Collect baseline data 🔗

Without knowing the starting point, it is impossible to credibly claim a change occurred. A baseline survey or record at the outset of a programme is what allows a later comparison to actually mean something.

Use a mix of internal monitoring and external review 🔗

Continuous internal monitoring keeps a programme on track day to day, while periodic external evaluation adds credibility and an outside perspective for major decisions, funding renewals, or scale-up plans.

Involve stakeholders in the process 🔗

Participatory evaluation, where the community or beneficiaries help generate and interpret data, tends to produce findings that are more readily accepted and acted upon, since people are more likely to trust conclusions they helped shape.

Evaluation in action: examples from extension and development projects 🔗

India’s rural employment guarantee programme offers a useful real-world example of evaluation types working together. The Ministry of Rural Development has periodically commissioned impact assessment studies on the Mahatma Gandhi National Rural Employment Guarantee Scheme, examining outcomes such as household income, wage levels, and living standards, functioning as a summative evaluation of the scheme’s broader impact. More recently, NITI Aayog’s Development Monitoring and Evaluation Office commissioned an independent evaluation of the same scheme, involving a large-scale field survey across thousands of households, which is a clear example of an external evaluation being used to assess a national programme’s on-ground impact. Academic researchers have also evaluated the scheme’s specific effects on agriculture, such as how MGNREGA-supported assets like irrigation and drought-proofing influence crop yields and productivity, published in the Indian Journal of Extension Education.

Agricultural extension projects with a nutrition focus show the process side of evaluation just as clearly. The UPAVAN trial in rural Odisha, which tested a nutrition-sensitive agricultural extension approach using women’s group video sessions, planned its economic evaluation around measuring specific costs and outcomes and comparing incremental changes against a baseline, illustrating the measurement-to-assessment sequence in a real extension setting, as described in this study protocol for the UPAVAN trial. Together, these examples show that evaluation types and process stages are not just theoretical categories from a textbook. They shape how billions of rupees in public programmes and community-level extension work are actually judged and improved.

What do you think? If you were designing an evaluation for a local extension programme in your area, would you lean more on internal monitoring or push for an external review, and why? And looking at the difference between measurement and final evaluation, where do you think most programmes tend to stop short?

References

1. http://eagri.org/eagri50/AEXT392/lec02.html
2. https://www.fao.org/4/w5830e/w5830e0d.htm
3. https://sarkaridiary.in/external-and-internal-evaluation-advantages-and-disadvantages-b-ed-notes/
4. https://www.arcolab.org/en/5-vantaggi-valutazione-monitoraggio-cooperazione-sviluppo/
5. https://teachers.institute/assessment-for-learning/measurement-assessment-evaluation-education/
6. https://www.researchgate.net/publication/382849418_Evaluation_and_Impact_Assessment_of_Extension_Programs
7. https://rural.nic.in/en/press-release/study-assess-impact-mgnregs
8. https://eng.ruralvoice.in/national/niti-aayog-to-evaluate-mgnrega-scheme-to-assess-its-impact.html
9. https://journals.acspublisher.com/index.php/ijee/article/view/22059
10. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6537168/