Disclaimer: The activities in this document are intended for example purposes only. The actual activities implemented as part of TB program 

evaluation should be identified by state or local TB program officials in collaboration with other stakeholders. The example provided here is 

not intended to be applied directly to any specific TB program

A logic model illustrates the association between your program’s resources, activities, and intended outcomes. Logic models can

• Vary in size and complexity

• Focus on a specific aspect of your TB program, such as a single evaluation question or objective, or encompass the entire program

• Be used to develop evaluation plans

• Be revised and updated to reflect changes in activities, new evidence, and lessons learned

Logic models are useful tools for program planning and evaluation because they

• Guide staff in thinking about and evaluating their program

• Identify assumptions and potential challenges

• Assist in identifying intended programmatic outcomes

• Organize, connect, and identify gaps in evaluation efforts

Thinking of a logic model as a series of if . . .then statements will be helpful. The following graphic was designed to illustrate the idea of using 

if . . . then statements in developing a logic model for your program. The source content for the graphic and accompanying logic model 

component definitions are adapted from CDC’s Division for Heart Disease and Stroke Prevention’s comprehensive guidance on developing a 

logic model.
Disclaimer: The activities in this document are intended for example purposes only. The actual activities implemented as part of TB program 

evaluation should be identified by state or local TB program officials in collaboration with other stakeholders. The example provided here is 

not intended to be applied directly to any specific TB program

Logic Model Component Definitions

• Inputs are the resources (dollars, staffing, and materials) that go into a program or intervention — what we invest.

• Activities are events undertaken by the program or partners to produce desired outcomes — what we do.

• Outputs are the direct, tangible results of activities — what we get.

• Outcomes are the desired results of the program — what we achieve.

o Short-term outcomes are the immediate effects of the program or intervention activities.

o Intermediate outcomes are the intended effects that occur over the midterm of the project period.

o Long-term outcomes refer to the desired program results.

Adapted from: CDC Division for Heart Disease and Stroke Prevention Evaluation Guide: Developing and Using a Logic Model.
Disclaimer: The activities in this document are intended for example purposes only. The actual activities implemented as part of TB program 

evaluation should be identified by state or local TB program officials in collaboration with other stakeholders. The example provided here is 

not intended to be applied directly to any specific TB program

The following logic model example accompanies the evaluation plan for Completion of Treatment for Tuberculosis Disease by Using 

Incentives and Enablers. Other ways to structure a logic model can also be used. CDC’s Program Performance and Evaluation Office provides 

additional examples of simple and complex logic models and checklists for developing them.

Logic Model Example: Completion of Treatment for Tuberculosis Disease by Using Incentives and Enablers*

Inputs Activities Outputs

(No. and %)

Short-Term 

Outcomes (%)

Intermediate-Term 

Outcomes (%)

Long-Term 

Outcomes (%)

Funding to support 

bus passes or

extended clinic 

hours

Adequate staffing

to conduct 

activities

Support from 

management for 

conducting

activities, including 

extended clinic 

hours

Provide incentives 

to patients

Extend hours for inpatient DOT

Train staff on 

strategies for

following up after

missed 

appointments

Follow up same day 

after missed 

appointments

Patients who are 

given bus passes

Patients who come 

to clinic during 

extended hours

Staff trained on 

strategies for

following up after

missed 

appointments

Patients who miss 

visits and are 

rescheduled within 

24 hours

Decrease in 

patients who 

experience 

transportation and 

scheduling barriers

Increase in patients 

who arrive at the 

clinic for in-person 

DOT

Decrease in 

patients with 

missed doses of inperson DOT

Increase in patients 

completing TB 

treatment

Abbreviations: DOT, directly observed therapy; TB, tuberculosis.

* See Completion of Treatment for Tuberculosis Disease by Using Incentives and Enablers for the accompanying program evaluation plan

example.