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If you have to report a bug to a programmer who can't be present in person (or via remote support tools), then you want to ensure they can reproduce the problem. If they can't, they may have to assume that there's a user error.

Report exactly what you did leading up to the error. If it's a graphical program, report exactly which buttons you pressed, and in what order you pressed them. If it's a command-line program, capture precisely what command you typed - this is where tools like `script` and `tee` can again come in handy!

Make sure the bug report has all the input you can think of. If the program reads from a file, add a copy of the file. If the program talks to another computer over a network, while you can't send a copy of that device, you can report what kind of system it is, and (if you can) what software is running on it.

"works for me. so what goes wrong?"

If you report a long list of inputs and actions, and the developer(s) attempt to recreate the problem, but nothing goes wrong, then you haven't given them enough information. Possibly the fault doesn't show up on every computer; your system and theirs may differ in some way. Possibly you have misunderstood what the program is supposed to do, and you are both looking at exactly the same display but you think it's wrong and they know it's right.

Therefore, you must also describe what happened. Report exactly what you saw. State why you think what you saw is wrong; better still, explain exactly what you expected to see. If you say something like "and then it went wrong", you have left out a lot of very important information. If you saw error messages, then report, carefully and precisely, what they were - they are important! At this stage, the developer is not trying to fix the problem: they're trying to find it. They need to know what has gone wrong, and those error messages are the system's best effort to tell you that. Write the errors down if you have no other easy way to remember them; it's not worth reporting the program generated an error unless you can also report what the error message was.

In particular, if the error message has numbers in it, do report them! Just because you can't see any meaning in them doesn't mean there isn't any. Numbers contain all kinds of information that can be interpreted by the developers, and they are likely to contain vital clues. Numbers in error messages are there because the computer is too confused to report the error in words, but is doing the best it can to get the important information to you somehow.

At this stage, the programmer is effectively doing detective work - they don't know what's happened, and they can't get close enough to watch it happening for themselves, so they are searching for clues that might give it away: error messages, incomprehensible strings of numbers, and even unexplained delays are all just as important as fingerprints at the scene of a crime. Keep them! If you are using a Unix-like environment, the program may have produced a core dump. Core dumps are a particularly good source of clues, so don't throw them away. Make sure you put in the bug report you have such dumps; the development team may want them added to the case. Be aware that the core file typically contains a record of the complete state of the program: any "secrets" involved (maybe the program was handling a personal message, or dealing with confidential data) may be contained in the core file.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Debugging and supporting software systems. OpenStax CNX. Aug 29, 2011 Download for free at http://cnx.org/content/col11350/1.2
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