Mpango huu unaongeza ufanisi.

In Swahili, demonstratives such as this and that usually come after the noun, not before it.

So:

• mpango huu = this plan
• not huu mpango in normal usage

This is a very common word order pattern in Swahili:

• mtu huyu = this person
• kitabu hiki = this book
• mpango huu = this plan

Because huu has to agree with the noun class of mpango.

Swahili nouns are grouped into noun classes, and words connected to the noun often change form to match that class. Mpango is a singular noun in the m-/mi- class pair, and its singular demonstrative is huu.

So:

• mpango huu = this plan
• mipango hii = these plans

Notice how both the noun and the demonstrative change in the plural:

• mpango → mipango
• huu → hii

Unaongeza can be broken down like this:

• u- = subject marker agreeing with mpango
• -na- = present tense marker
• -ongeza = verb stem meaning increase, add, or make greater

So unaongeza literally means something like:

• it increases
• or it is increasing

The dictionary form of the verb is kuongeza.

The u- is a subject marker. In Swahili, verbs usually include a prefix that agrees with the subject.

Since mpango belongs to a noun class that takes the singular subject marker u-, the verb must match it:

• Mpango huu unaongeza ufanisi.
• literally: This plan it-increases efficiency.

English does not do this kind of agreement on most verbs, so this often feels new to English speakers.

Compare:

• mpango huu unaongeza... = this plan increases...
• mipango hii inaongeza... = these plans increase...

The subject marker changes when the noun changes.

-na- is the common present tense marker in Swahili.

In context, it can mean:

• a general present: increases
• or a present ongoing action: is increasing

So unaongeza can be understood as:

• increases
• is increasing

Which one sounds best depends on context. In a sentence like this, English usually uses the simple present: This plan increases efficiency.

Because this is a normal verb sentence, not an equational sentence.

Ni is commonly used in sentences like:

• Huyu ni mwalimu. = This is a teacher.
• Huu ni mpango mzuri. = This is a good plan.

But in Mpango huu unaongeza ufanisi, the predicate is already a full verb: unaongeza. So ni is not needed.

In other words:

• X ni Y = X is Y
• X unaongeza Y = X increases Y

This is a very useful distinction.

• kuongeza = to increase something, to add to something
  
  • transitive
• kuongezeka = to increase, grow, become greater
  
  • intransitive

In your sentence, mpango is causing an increase in ufanisi, so kuongeza is the right verb:

• Mpango huu unaongeza ufanisi. = This plan increases efficiency.

If you used kuongezeka, the meaning would shift more toward efficiency increases:

• Ufanisi unaongezeka. = Efficiency is increasing.

Ufanisi is an abstract noun meaning efficiency or effectiveness. The u- here is part of the noun itself, not a separate prefix you can remove freely in this sentence.

Many abstract nouns in Swahili begin with u-, for example:

• uzuri = beauty
• ugumu = difficulty/hardness
• ufanisi = efficiency

This u- is different from the u- in unaongeza, which is a verb subject marker.

So in the sentence:

• u- in unaongeza = grammatical agreement on the verb
• u- in ufanisi = part of the noun

Swahili does not have articles like a, an, or the.

So a noun often appears by itself, and the exact English translation depends on context.

• ufanisi could correspond to efficiency, the efficiency, or sometimes an efficiency-related quality, depending on context

In this sentence, the natural English translation is simply:

• This plan increases efficiency.

You would say:

Mipango hii inaongeza ufanisi.

Here are the changes:

• mpango → mipango = plan → plans
• huu → hii = this → these
• u- → i- in the verb = singular agreement changes to plural agreement

So:

• Mpango huu unaongeza ufanisi. = This plan increases efficiency.
• Mipango hii inaongeza ufanisi. = These plans increase efficiency.

A natural negative form is:

Mpango huu hauongezi ufanisi.

This means:

• This plan does not increase efficiency.

What changed?

• u-...-na-...-a becomes a negative form with hau- and final -i
• unaongeza → hauongezi

So:

• unaongeza = increases / is increasing
• hauongezi = does not increase

This negative pattern is very common in Swahili verbs.