14.2 Consecutive, Simultaneous & Blended Interpreting: Choosing and Managing the Mode

The CASLI Generalist Performance Exam requires candidates to interpret "using consecutive interpreting, simultaneous interpreting, sight translations or any combination thereof, within each scenario." The NIC Role Delineation Study lists knowledge of "when to use simultaneous or consecutive interpreting" and "need for consecutive or simultaneous interpreting" as separate blueprint items. Mode selection is a tested competency in its own right.

1. The two modes

Simultaneous interpreting produces the target message while the source continues. The interpreter is receiving, analyzing, restructuring, and producing at the same time, with a lag of roughly two to six seconds. It is the default in most American community settings, largely by habit rather than by analysis.

Consecutive interpreting waits for a complete chunk of source message, then renders it. The interpreter may take notes. Turn-taking is explicit: source, pause, target, pause, source.

2. Why consecutive is usually more accurate

This is one of the most counter-intuitive facts on the exam, and it follows from cognitive load.

In simultaneous mode the interpreter must hold incoming material in working memory while simultaneously producing output — two competing demands on the same limited resource. Comprehension is necessarily partial, because the interpreter commits to a rendering before the utterance is complete. Errors of prediction are common: the interpreter guesses where a sentence is going, and the speaker turns.

In consecutive mode the interpreter hears or sees the entire unit before producing anything. Analysis is complete. The interpreter knows the topic, the referents, the spatial layout required, the negation, and the conditional structure — all of which in ASL frequently appear grammatically before the material that motivates them. The result is typically fewer omissions, fewer additions, better spatial structure, and better register.

The cost is time: a consecutively interpreted encounter takes noticeably longer.

3. When to choose consecutive

4. When simultaneous is the right choice

• Lectures, presentations, and platform work, where a speaker cannot reasonably pause and the audience expects continuous delivery.
• Multi-party meetings where consecutive would destroy the flow of a discussion.
• Media, performances, and streamed events on a fixed timeline.
• Routine, low-stakes exchanges where a small loss of precision does not carry consequence.
• Where the consumer prefers it. Some consumers experience consecutive as slow, patronizing, or marking them out.

5. Blending within one encounter

The professional norm is not to pick a mode for the assignment but to move between modes as demand shifts. A single medical appointment might run simultaneously through history-taking and small talk, shift to consecutive for the diagnosis and treatment options, use sight translation for the consent form, and return to simultaneous for scheduling.

Blending requires announcing the shift so the parties are not confused: a brief, neutral process statement — "I'm going to ask you to pause after each step so I can interpret completely" — is sufficient.

6. Managing consecutive in practice

• Chunk by meaning. Take a complete proposition, not a fixed number of sentences. Stop the speaker at a natural boundary.
• Signal clearly and consistently. Agree in advance how you will indicate "hold" — a raised hand, a small gesture. Use the same signal every time.
• Take notes for structure, not verbatim content. Numbers, names, lists, and the sequence of propositions. Notes are a memory prompt, not a transcript.
• Handle your notes under Illustrative Behavior 1.2. Notes are consumer-specific information; destroy them by shredding at the end of the encounter, and never carry them out of a secure setting.
• Expect resistance and manage it once. Speakers trained on simultaneous interpreting often forget to pause. Re-establish the pattern with a process statement rather than absorbing a longer and longer chunk.

7. Lag time in simultaneous mode

Lag (décalage) is the interval between receiving and producing. It is a control, not an accident.

• Too short and the interpreter is rendering form rather than meaning, producing English-ordered signing under time pressure and mispredicting where sentences are going.
• Too long and working-memory load exceeds capacity; material is dropped, and turn-taking cues are missed.
• Optimal lag varies with content density, familiarity, and direction. Prepared, familiar content supports a longer lag; unfamiliar technical content forces a shorter one, which is precisely why preparation improves accuracy.

Deliberately lengthening lag is one of the most effective in-assignment controls available: it converts a marginal simultaneous performance into a near-consecutive one, buying analysis time without stopping the encounter.