AGRI90093 Chap.4 Theories of Change
Theories of Change
Theory gives practitioners testable explanations for how change may occur, but no single framework fits every case. This chapter compares diffusion and ADOPT, collaborative inquiry and process facilitation, and expert, transactional and developmental service relationships.
Theory selection starts with attributes of the change, population and relationship, then assigns each chosen lens a distinct mechanism, action and limitation.
What this chapter covers
- 01
Theory as a way to connect knowledge, mechanism, action and testing
- 02
Diffusion, adopter categories, the cumulative adoption curve and innovation attributes
- 03
ADOPT as a structured prediction tool for a specified practice-population pairing
- 04
Collaborative inquiry, social learning, participation and facilitation under uncertainty
- 05
Expert, transactional and developmental service relationships
- 06
Combining frameworks without duplicating claims or erasing participant agency
Worked example · free
Build a theory blend for biosecurity records
- 1Use diffusion to examine relative advantage, complexity, observability and varied uptake.
- 1Use collaborative inquiry to adapt the workflow and negotiate acceptable data sharing.
- 1Use developmental advice to fit records into enterprise routines and build capability.
- 1Test whether access and participation are broad enough to avoid reproducing the original gap.
Key terms
- Diffusion
- The process through which an innovation spreads across a population over time.
- Relative Advantage
- The perceived improvement an innovation offers compared with current practice.
- Collaborative Inquiry
- A facilitated process in which participants investigate and adapt action together.
- Developmental Relationship
- A helping relationship that builds client capacity through mentoring, coaching and shared diagnosis.
Theories of Change FAQ
How do I choose between theories of change?
Describe the change, population, uncertainty, involvement, norms, autonomy and resources before naming a theory. Choose the framework whose mechanism clarifies the case, convert that mechanism into a support action and state a limitation that the evaluation should test.
What can diffusion theory explain well?
Diffusion helps examine innovation attributes and patterned uptake across a population. It can support estimates of timing and peak adoption for a defined practice-population pairing. It becomes weak when categories substitute for understanding individual reasons, resources, context or agency.
When is collaborative inquiry especially useful?
Collaborative inquiry suits complex, uncertain or contested situations where participants must learn and adapt together. It uses interaction, experience and facilitation to support agency. Participation still requires careful design because time, power and unequal voice can limit whose knowledge shapes the result.
Assessment move
Create one comparison table with theory, best question, mechanism, action and blind spot. Apply it to three new cases rather than memorising labels. For diffusion, keep population patterns separate from individual explanations. For collaborative inquiry, specify what participants will investigate and how facilitation protects meaningful participation. For service relationships, state who defines help and where power sits.
A strong blended response assigns a distinct job to each lens and includes an evaluation test. If two theories lead to the same sentence, revise or remove one. Turn each theory into a prediction before choosing activities. A diffusion lens might predict that observability, compatibility and network connections shape the spread of a practice.
A collaborative inquiry lens might predict that participants build useful understanding by investigating a shared problem and interpreting evidence together. A service-relationship lens might predict that trust, negotiated purpose and the fit between offered and requested help affect engagement. State what evidence would make each prediction less plausible. This prevents theory names from becoming decorative citations.
For diffusion practice, sketch both the innovation-decision process and the social system through which information travels. Keep an aggregate adoption curve separate from the reasons any particular person acts. Test claims about adopter categories against context rather than turning them into fixed personalities.
Identify how relative advantage, complexity, trialability, observability and compatibility could be experienced differently across groups. Then design one activity and one evaluation question that address a specific attribute or network mechanism.
For collaborative inquiry, write the inquiry cycle as concrete work: framing the question, gathering or producing evidence, interpreting results, deciding what to try and reflecting on consequences. Specify who participates at each stage, what knowledge is recognised and how disagreement will be handled. Facilitation should change the quality of inquiry and participation, not merely make a meeting pleasant.
Add a check for token participation, unequal speaking authority or a problem definition that was fixed before participants arrived. For service relationships, compare provider-centred, client-centred and relational assumptions in the same encounter. Note who defines the need, how expertise is offered, what obligations are created and whether the participant can refuse or reshape the service.
Translate the preferred relationship into practitioner behaviours such as eliciting purpose, negotiating roles, checking understanding and revisiting consent. Link those behaviours to evidence about trust, usefulness and participant agency. Practise blending only after each theory has earned a distinct role.
Write the mechanism supplied by the first lens, the design decision it informs and the limitation covered by the second lens. If the blend produces a longer vocabulary but no different action or test, simplify it. Finish each case with a small theory-based evaluation plan: one indicator for the proposed mechanism, one for participation or relationship quality and one for the intended practice or capacity outcome.
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