DE Prereq Chains: SSC 100 Gates 606 Courses (2026)

Delaware Technical Community College (Del Tech) is a single statewide institution with four campuses — one of the few states where a single community college system serves the entire state. That means when we mapped prerequisite chains across Del Tech's 720 courses, we were looking at one catalog, not fifteen.

The numbers reveal a distinctive pattern: a student success course called SSC 100 is the single largest prerequisite bottleneck in the state, sitting upstream of more downstream courses than any English or math prerequisite. Here's what that means and why the math sequence is the other chain you need to map before registering.

#The shape of the prereq landscape

Of 720 Del Tech courses with prerequisite data, 416 involve chains of three or more sequential courses — roughly 58% of all courses with prerequisites. The maximum chain depth in the system is 9 courses.

That's shorter than states like South Carolina (depth 21) or Massachusetts (depth 13), but 9-course chains still represent multiple semesters of sequenced coursework — and as with every state, the time cost compounds when you add developmental prerequisites.

#The unusual top bottleneck: SSC 100

SSC 100 sits upstream of 606 Del Tech courses — more than any other course in the state's prereq graph.

SSC 100 is a student success and college orientation course, not a developmental English or math prerequisite. Its position as the dominant bottleneck is unusual compared to other states where developmental English or reading holds that role.

What this means: Del Tech treats SSC 100 as a foundational gateway for a broad range of programs. If you need it and haven't taken it yet, it may affect when you can start coursework across multiple departments.

The rest of the top blockers look more conventional:

| Course | Downstream Courses Gated | |---|---| | SSC 100 | 606 | | ENG 011 | 187 | | ENG 101 | 186 | | BIO 120 | 175 | | MAT 020 | 139 | | MAT 062 | 139 | | MAT 162 | 138 | | MAT 099 | 128 | | MAT 183 | 113 | | MAT 010 | 102 |

ENG 011 is a developmental writing course — the entry point for students who place below college-level composition. ENG 101 is the standard college-level composition course that most programs require. Together they gate 186–187 downstream courses.

The math sequence is the other significant chain: MAT 010 → MAT 020 → MAT 062 → MAT 099 → MAT 162/183. Students who place at the developmental math entry (MAT 010 or MAT 020) have four or five sequential math courses before they reach calculus-track or chemistry-track coursework.

#The deepest chains: engineering technology and medical lab

The deepest chain in the Del Tech system (9 courses) runs through two distinct programs: engineering technology and medical laboratory technology.

Engineering technology chain to MET 271 (Advanced Mechanical Engineering Technology):

MET 271 → MET 245 → MET 264 → CET 270 → CET 258
  → PHY 281 → MAT 281 → MAT 193 → MAT 183 → MAT 099

Nine courses from MAT 099 (Intermediate Algebra) to upper-level mechanical engineering technology. If you place below MAT 099 — into MAT 020 or MAT 062 — you add one or two more math courses before the chain starts.

Medical lab technology chain to MLT 291 (Medical Laboratory Internship):

MLT 291 → MLT 251 → MLT 250 → MLT 121 → MLT 120
  → CHM 150 → MAT 281 → MAT 193 → MAT 183 → MAT 099

Also 9 courses, routing through chemistry rather than physics, but requiring the same math foundation. MLT programs typically run on specific cohort schedules — missing the start of a cohort can mean waiting an entire year.

Both chains make the same point: math placement is the primary variable for technical and science-based programs at Del Tech. Where you place into math determines not just your math timeline, but the timeline for every program-specific course that depends on it.

#What SSC 100 means practically

Because SSC 100 gates 606 courses, the first practical question is: does your program require it, and when?

Check this before your first semester, not after. If SSC 100 is a first-semester requirement in your program, it's worth taking early to preserve your ability to move through the rest of the sequence without interruption. If it's listed as a prerequisite for a specific course you need in semester two or three, the question becomes whether you can take it concurrently with other first-semester courses.

Del Tech advisors can clarify whether SSC 100 is enforced as a hard prerequisite in practice or whether it functions more as a recommended first course. That distinction matters for planning.

#What to do before you register

First: understand your starting point. Del Tech uses placement testing (or accepted substitutes like Accuplacer scores, SAT/ACT results, or prior college coursework) to determine whether you enter at ENG 011 or ENG 101, and at which math level. Take the placement test or gather your documentation before building your course plan.

Second: pull the full chain for your program. Del Tech's course catalog lists prerequisites for every course. For any program with a deep technical or health sciences sequence, trace from the last required course back to your current placement. Count the semesters.

Third: check SSC 100's position in your program specifically. It blocks a lot of courses statewide, but whether it's a first-semester requirement, a second-semester prerequisite, or not required at all depends on your specific program.

You can search Del Tech courses — including prerequisites and section availability — at Community College Path's Delaware course search.

#Del Tech in context

Del Tech's maximum chain depth of 9 is notably shorter than South Carolina's SCCTCS system, which reaches 21, or Massachusetts community colleges, which reach depth 13. The shorter maximum doesn't mean fewer constraints — 9-course chains in Del Tech's engineering and MLT programs still span multiple semesters — but it does mean the planning window is somewhat more compressed and predictable.

The distinctive feature of Delaware's system is SSC 100's gating role. Most states we've analyzed have developmental English or math at the top of the bottleneck list. Del Tech's use of a student success course in that position is different, and it's worth understanding early whether SSC 100 is in your critical path.

For comparison, Georgia's TCSG system shows developmental English gating 1,400+ downstream courses, and North Carolina's NCCCS has ACA 085 and dev English gating 900+. The bottleneck mechanism differs — a student success course vs. developmental English — but the planning implication is the same: identify the gateway course for your program and schedule it early.

For a full explanation of how prerequisite chains form across states and why they extend timelines beyond what students typically expect, see Why Your Four-Semester Community College Plan Is Actually Six.