Example objectives:

DOK 1:
The student will label the parts of a fish (DOK 1).
The student will recognize nouns in a sentence (DOK 1).

DOK 2:
The student will graph the results of the survey (DOK 2).
The student will compare types of governments (DOK 2).

DOK 3:
The student will construct persuasive essays (DOK 3).
The student will assess the use of colors to portray mood in art (DOK 3).

DOK 4:
The student will critique government policies on unemployment during the Great Depression (DOK 4).
The student will design a program for addressing invasive fish species in the Mississippi River (DOK 4).

The importance of Depth of knowledge (DOK) goes beyond the objectives. DOK will also influence the instructional strategies you use. For example, instructional activities on how to label the parts of a fish will look much different than instruction on how to design a plan to address invasive fish. Unit plans should address different levels of DOK. When moving students through the levels, often teachers will start with lower DOK levels and move students to higher DOK levels once a foundation is set. Here is a good explanation of DOK with verbs and possible assessments/evidence.