Category: Quality Management

Judging The Quality of Oriental Rugs

Oriental carpets are works of art –unique and exquisite – worthy of collections. But when it comes to buying oriental rugs, most people shy away or hesitate. It’s difficult to judge its quality and they can never know whether they are being ripped off or their purchase is really worth it. There simply is not one single factor determining the value and quality of oriental rug. People often talk about the knot density but it does not completely define the quality of oriental rug. It is not even one of the most important factors appraisers consider in determining the value of an oriental rug. Below is a list of considerations for determining an oriental rug’s quality and value.

Finely woven or knotted rugs are preferred for its softness and smoothness. The curved lines in a rug can be created more smoothly and gracefully with many knots in a square inch. Higher knot count per square inch means rug took a longer time to weave and so the rug piece is finer and better quality. Hence it would be more expensive. Also, rugs that are finely knotted reflect light better because their surface is so dense. Usually oriental rugs have higher knot count and so does floral and curvilinear patterns.

However, keep in mind that higher knot count is only one measure of a rug’s quality. There are cases where finer knots are not used such as in tribal rugs and geometrical shapes with straight lines requiring less knots per square inch. A rug of different origin and different design may be more expensive, even though it has a lower knot count. Pattern type and desired design assigns the knot size. One quick way to tell some about the durability of an Oriental rug is to feel the handle of it. If it is very loosely woven it is going to feel very flimsy in your hand it is not going to wear as well as a rug with a sturdier but still supple handle.

Pile density varies from one rug to the next. The thickness can affect the longevity of a carpet. Usually the tighter and denser pile is, the better the rug will wear. Though there are some exceptions, the large majority of Oriental rugs whose pile is on the longer side tend towards a lower quality. Longer piles are more apt to deliver fuzzy designs and are less durable than their shorter counterpart, often being compressed over time and making them susceptible to wear. Unless the rug is going to be hung or placed in a no-traffic area, be sure the pile will stand up to use.

Take your fingers and try to wiggle them into the pile. Is it difficult to work them all the way to the bottom of the pile? If so the carpet is dense and tight, which means it will have greater resistance to wear and tear, and likely to wear well. Sparser pile is more likely to get worn out faster.

The high quality materials involved in an oriental rug’s crafting is what defines its illustrious composition. Better the material, better the rug’s quality. These materials include neat wool and silk. And a rug made from high-grade, hand-spun wool or silk will give off a certain luster which a rug made from synthetic materials and machine made cannot duplicate.

Importance of Quality Management in Forensic Science

When an item of evidence that could be crucial to securing a conviction appears in court judge and jury want to be sure that it really is relevant to the crime. The only way of fulfilling this requirement is to make the concept of quality central to everything the forensic investigator does with the evidence i.e from collecting it to presenting it in court. This striving for quality is not confined to forensic science, it is found in most other industries such as from pharmaceuticals to aerospace. The underlying goal is to offer products and services to the public that are safe and effective. In forensic science quality of evidence is important because if first-rate evidence is not submitted in court the guilty may go unpunished or equally an innocent person may lose their liberty.

The terms quality control (QC) and quality assurance (QA) are often used interchangeably. Their meanings may differ from place to place and between different kinds of activity. Put simply, QC covers all the different activities done to fulfill quality requirements for a product or service. In forensic science, this might cover the need to run control samples when doing a DNA analysis or to keep records of exactly what was done in the microscopic examination of a hair sample. The term QA is a broader one covering the overall system of dealing with evidence and includes issues such as staff training and qualifications and the laboratory environment. A disorganized laboratory with no clear chain of command cannot reasonably be said to be providing good QA.

The idea of quality began with the medieval craftsman who organized themselves into guilds dedicated to making products of a high standard. Products that reached the quality standards of an inspecting committee would receive a special quality mark. Master craftsmen began to add their own quality marks to their products to guard their reputation and standards. Customers who bought products bearing inspection and master craftsman marks were assured of the quality of their purchase. It was in the twentieth century that the concept of quality was broadened to include many more products and services including forensic science. The medieval quality marks have evolved into a more general idea of standards which are procedures, metrics (measurements), behaviors or whatever is needed in a particular activity to guarantee a quality output. Standards vary from place to place so, there is a need for some kind of international reference. After all, the result of DNA identification should not vary depending on the country or laboratory where it was done. If the defense orders a second opinion then it merely confuses matters if the second lab follows a different procedure from the first one. The ISO (International Organization for Standardization) 9000 series is a set of international standards on quality management and QA/QC, which was established in 1987 and is constantly being updated and revised. A lab dedicated to the forensic investigation can be registered to ISO 9000 standard which gives proof of the quality of its work. Another important idea in the improvement of quality is benchmarking. This involves a search for a benchmark. Quality is an evolving concept with organizations and individuals continually being challenged to reach ever-higher standards. In science, methods and equipment are changing all the time and laboratories and their personnel must keep up and adapt. For crime investigation, this can only be a good thing for it means enhancing the court’s confidence in the evidence being presented.

In the context of the forensic investigation, QC/QA covers scientific, legal and ethical aspects of the work of both laboratory scientists and the police scene of crime officers. Forensic science involves many different disciplines from pathology and chemistry to engineering and entomology. Whatever the nature of the evidence, however, its preservation from deterioration or contamination is paramount. Trace evidence, in particular, is vulnerable in this respect. Protective clothing at the scene and restricted access can help preserve the evidence that is present. After that, proper securing and packaging is essential. Once in the laboratory, the evidence must be correctly stored which may involve refrigeration or protection from moisture and it must never be left unattended or unsecured in case of tampering or theft.

When it comes to laboratory investigation of the evidence there will be Standard Operating Procedures (SOPs) and Standard Methods (SMs) that must be followed. These are written instructions as to how to carry out a given task using properly tried and tested methods. These SOPs and SMs will change over time as new methods, equipment and evidence emerge. A court would, rightly not be impressed to discover that a forensic laboratory was still carrying out, for example, fingerprint analyses according to a method from the 1950s.

A wide range of equipment, including spectrometers, microscopes, cameras and gas chromatographs is used in the forensic laboratory. An important part of QA/QC is ensuring all this equipment is properly used by staff that has received correct training. The equipment must also be properly and regularly calibrated. It must also be regularly maintained and replaced or upgraded if faults occur.

Quality standards apply as much if not more to the people working in the forensic laboratory as to the equipment and methods they use. First, the person must have the appropriate scientific qualifications for the job. Requirements may vary but each person should have a written job description including their responsibilities, duties, and skills required. The manager of the laboratory will have had several years of experience in forensic work. Technicians will have qualifications appropriate to the type of work they are carrying out. Everyone’s work needs to be supervised and audited both internally and externally. Because forensic science is such a rapidly evolving discipline it is essential that there be provision for continuing education for everyone employed in the laboratory. This might include the opportunity to take a higher degree and will certainly involve taking courses to learn new techniques from time to time and keeping up with the professional literature to increase awareness of developments. In addition, an important part of being a forensic science professional is to be prepared to testify in court. This may involve fierce cross-examination and the individual must be objective and confident enough to defend their work as well as making the principles and detail involved accessible to the judge and jury.

Everyone working in a forensic laboratory must do all they can to take a scientific and objective approach to their work just as one would in any other laboratory setting. This means being unbiased, prepared to repeat experiments, using control and reference samples and keeping accurate records of procedures carried out and results obtained. Over and above this, there are special requirements for forensic investigators relating to ethical and legal aspects of the work. Perhaps the most important requirement here is an awareness of the importance of the chain of custody of evidence. This means that it must be clear to the court exactly what has happened to the evidence from the moment of its collection to its presentation in the courtroom.

There are significant pressures on all laboratories that undertake forensic science work for the Criminal Justice System to implement a quality management system in their respective organizations: Police procurement: For some years now police procurement initiatives have demanded that their contracted forensic science providers have the international quality standard ISO 17025 accreditation for all “tests” performed on their behalf. The Forensic Science Regulator: has drawn up plans to ensure that the “provision of forensic science services across the criminal justice system is subject to an appropriate regime of scientific quality standards”. This proposal means that all laboratories offering forensic science services to the Criminal Justice System will have to adopt a quality management system. This requirement will apply to any police laboratory undertaking any type of forensic science work i.e from screening exhibits to retrieving body fluids and other trace evidence for subsequent analysis. If an organization has no previous experience of designing, implementing and maintaining such quality standards especially for a discipline as complex as forensic science, trying to plan for such can be a daunting task.

Forensic Access has a significant experience of developing, implementing and maintaining quality management systems in forensic science laboratories and this service is now offered to police and other organizations. We can assist in planning for, establishment and maintenance of quality management systems to comply with ISO 9001 & ISO 17025 including the special requirements of ILAC G19 Guidelines for Forensic Science Laboratories.