Top-down and bottom-up design

Top-down and bottom-up are both strategies of information processing and knowledge ordering, used in a variety of fields including software, humanistic and scientific theories (see systemics), and management and organization. In practice, they can be seen as a style of thinking and teaching.

A top-down approach (also known as stepwise design and in some cases used as a synonym of decomposition) is essentially the breaking down of a system to gain insight into its compositional sub-systems in a reverse engineering fashion. In a top-down approach an overview of the system is formulated, specifying but not detailing any first-level subsystems. Each subsystem is then refined in yet greater detail, sometimes in many additional subsystem levels, until the entire specification is reduced to base elements. A top-down model is often specified with the assistance of "black boxes", these make it easier to manipulate. However, black boxes may fail to elucidate elementary mechanisms or be detailed enough to realistically validate the model. Top down approach starts with the big picture. It breaks down from there into smaller segments.

Top-down (disambiguation)

Top-down is a design strategy of information processing and knowledge ordering.

Top-down may also refer to:

Science

Computing

See also

Top Down

"Top Down" is a song by American hip hop record producer and recording artist Swizz Beatz. Featured as the eighth track on his debut studio album One Man Band Man. "Top Down" contains samples of swirls and riotous bursts of 70s-soul horns from "Girl, Come on Home" by Major Lance.

Background

In an interview with MTV Swizz Beatz explained the song was initially meant for Nas: "The record was originally for Nas. I got Nas' vocals already. But I can't do Nas, and his energy is not right on there. It would be dead weight. No disrespect, but it can't be dead weight if I can't make it feel like reality. I need the shit crazy. I need to shoot a video! It's gotta be another 'It's Me Bitches,' but bigger. I could easily pull a Nas card and have people be like, 'Nas is spazzing on the verse.' But it has to be a movie. I got it. It just gotta make sense. I can get Nas, Jay-Z and Jadakiss on that. I can do that. It's light work, but it's gotta make sense."

On May 30, 2009 the song Nas recorded over the beat leaked entitled "Be Worried".

DJ Envy

Raashaun Casey (born September 3, 1977), known by his professional name DJ Envy, is an American disc jockey (DJ). He is also one of the three hosts of the syndicated radio show The Breakfast Club with Angela Yee and Charlamagne Tha God and an MTV2 VJ for The Week in Jams.

Career

A native of Queens, New York, DJ Envy was tutored by neighborhood acquaintance DJ Clue?, who introduced him to the mixtape circuit in the mid-1990s. He quickly climbed up the ranks, and by the early 2000 he was peddling the latest freestyles and exclusives for big-name rappers like Jay-Z, 50 Cent and The L.O.X.. Since his reputation was so esteemed, DJ Clue signed him to their affiliate label Desert Storm Records. In 2003, he released his commercial debut album entitled The Desert Storm Mixtape: Blok Party, Vol. 1.

Envy's big break on the radio came when he mixed once a month for Hot 97's show called "Takin' it to the Streets", hosted by Angie Martinez from 12:00 am to 4:00 am, but later filled in when Angie Martinez got pregnant. He then co-hosted Hot 97's morning show with Miss Jones from 6 am-10 am daily. His run on the morning show ended in July 2008 when Miss Jones moved to Philadelphia. Envy spun on his own mixshows on Hot 97 called "The People's Mix" on Saturdays from 12:00 pm to 2:00 pm and "The People's Choice Hit List" on Sundays 5:00 pm to 8:00 pm. He had a segment on Hot 97 titled "New at 2", where he played the newest hits from 2:00 pm to 2:30 pm. He hosts Hip-Hop Nation's afternoon show on Sirius XM Radio on weekdays 5:00 pm to 10:00 pm EST and on weekends he used to do a show from 2:00 pm to 6:00 pm on Power 105.