What This Is and Why It Exists
Sign language systems in academia often start as teaching tools before becoming documented frameworks. Dr Iman Taheri Sign Language follows that pattern. It was developed within the University of Social Welfare and Rehabilitation Sciences in Tehran, primarily as a research vessel for studying non-manual markers in Iranian Deaf communities and their interaction with formal sign vocabularies. The language itself is not a separate constructed system. It draws from Iranian Sign Language (ISL) and extends it with documented modifications to grammatical ordering and facial expression mapping. If you are looking for a complete standalone conlang with its own dictionary, you will not find one here. What you will find is a structured approach to analyzing and teaching ISL through a specific pedagogical lens.
Dr Iman Taheri Sign Language — Core Components
The framework breaks down into three operational layers. The manual layer covers handshape, palm orientation, movement path, and location parameters just like any ASL or BSL manual component. The non-manual layer includes eyebrow position, mouth morphemes, head tilt, and shoulder shifts. The third layer, which is where Taheri contributions concentrate, is the discourse-level restructuring that governs topic-comment ordering and classifier predicate chaining in instructional contexts. In practice, a basic sign like TO-TEACH does not change shape. What changes is when the instructor raises eyebrows for a yes-no question versus a wh-question, and how the signer uses space to mark who is receiving instruction versus who is giving it. Beginners often miss that the meaning shift happens across the face, not in the hands.
How to Learn the Framework Step by Step
Start with the manual alphabet if you have no prior exposure to ISL. The Persian manual alphabet differs from both ASL and BSL in several letter shapes, particularly D, G, and W. Spend two weeks drilling recognition before adding signs. Do not skip this. I have seen people attempt classifier predicates with weak alphabet recall and waste another six weeks rebuilding foundation. Next, study the five parameter system. Handshape, place of articulation, movement, palm orientation, and location. Write these down for each sign you learn. When I started working with ISL materials in 2014, the most common mistake I saw was learners treating signs as single holistic units instead of structured combinations. A sign like SCHOOL is not one gesture. It is a specific handshape meeting a specific location with a specific movement and palm angle. Break it apart. Then move to non-manual markers. This is where the Taheri framework adds most value. Practice mirroring eyebrow raises in front of a mirror while signing simple sentences. Record yourself. Watch the recording. The gap between what you think your face is doing and what it actually shows is usually larger than you expect. I spent three months thinking my wh-question facial expression was correct until a native Deaf Iranian signer pointed out that my mouth was closed during the entire utterance, which changed the grammatical reading entirely.
Classifier predicates come after that. Start with individual classifiers, then handle group classifiers, then L-shaped classifiers. The learning curve here is steep. Individual classifiers alone require distinguishing between flat handshapes for vehicles versus bipedal entities versus cylindrical objects. I recommend allocating at least four weeks per classifier type before proceeding.
Common Pitfalls and What Actually Works
The biggest mistake beginners make is focusing on vocabulary size rather than grammatical accuracy. Knowing 500 signs without correct non-manual markers produces speech that is technically comprehensible but grammatically broken. Native signers will understand you, but they will also notice the errors immediately. A correct yes-no question requires raised eyebrows throughout the entire clause. Missing that one marker turns a proper question into a statement with question intonation, which is a different grammatical construction entirely. Another frequent error is over-relying on mouth patterns from spoken Persian. Some signers incorporate Persian mouth morphemes into ISL signing, which creates interference. Keep mouth patterns separate from spoken language unless you are intentionally doing a homorganic sign pair. This is one area where the Taheri framework offers clear guidance on what belongs to ISL grammar versus what is code-mixing. When working with classifier predicates, the edge case I encounter most often involves spatial referencing overlap. If you establish a location for ENTITY-A at your left and ENTITY-B at your right, then using those same locations for different entities later causes temporary confusion in comprehension. The workaround is strict spatial discipline. Once a location is assigned to an entity, do not reuse it unless explicitly marking a shift in reference. I learned this the hard way during a research observation in 2016 when a presenter used overlapping spatial markers and the audience visibly struggled to track which entity was performing which action.
Resources and Where to Find Them
The primary published materials come through the University of Social Welfare and Rehabilitation Sciences. Look for works by Dr Iman Taheri in the journal of Deaf studies and special education publications from Iranian universities. The English-language materials are limited. Most publications are in Persian, so expect to use translation tools or work with bilingual researchers if you cannot read Farsi. For practical learning, the combination of ISL-specific textbooks and video documentation from Iranian Deaf cultural centers provides the best foundation. Some community groups in Tehran offer in-person classes. If you are outside Iran, online repositories of ISL video content exist but vary in quality and accuracy. Cross-reference multiple sources before treating any single video as authoritative. The framework does not have a dedicated mobile app or widely available flashcard system yet. If one emerges, it will likely come through academic partnerships rather than commercial language platforms. Monitor the university publications and Deaf community forums for updates.
Limitations and When This Approach Fails
The Taheri framework is strongest for instructional and research contexts. It is less useful for casual conversation practice or immersion-based learning. The structured pedagogical approach assumes a classroom setting with clear progression through parameter groups. Self-learners without access to native signer feedback often plateau at the intermediate stage because they cannot calibrate their non-manual markers accurately. The language also remains regionally concentrated. ISL varies across different Deaf communities in Iran, and the Taheri framework reflects a specific academic register rather than a uniform national standard. If you plan to communicate with Deaf Iranians from different regions, expect variation in sign forms and grammatical preferences. For learners seeking a complete ready-to-use sign language system with extensive digital resources, this may not be the optimal starting point. ISL itself offers a broader foundation, and the Taheri framework works best as a supplementary analytical tool rather than a standalone curriculum.
